X Science Questions From CBSE Examination Papers Ch: Magnetic Effect of currents

1. Q. What is solenoid? Draw the pattern 0f magnetic field line of a solenoid through which steady current flows	2 Marks
2. Q. What are permanent magnet and electromagnet? Give two use of each.	2 Marks
3. Q. Differentiate short circuit and over loading?	2 Marks
4. Q. Draw the pattern of magnetic field lines of produce by current carrying circular loop	2 Marks
5. Q. What is role of fuse in domestic circuit? Why we use the fuse of defined rating not be replaced by one with large rating?	2 Marks
6. Q. How will deflection of compass get affected if current in straight wire is increased? support your answer with reason?	2 Marks
7. Q. No two field line intersect each other . Explain?	2 Marks
8. Q. What is the direction of thumb indicates in right hand thumb rule? In what way this rule is different from Fleming’s left hand rule?	2 Marks
9. Q. Why does a current carrying conductor kept in a magnetic field experience force? On what factor does the direction of this force depend? Name and state the rule used determination of direction of current?	2 Marks
10. Q. Two circular coil A and B placed closed to each other If the current in coil A is changed, will some current be induced in the coil B? Give reason?	2 Marks
11. Q. What do you mean by term magnetic field line? List any two properties?	2 Marks
12. Q. Give an activity to show magnetic field produce by current carrying circular loop?	2 Marks
13. Q. What precautions should be taken to avoid the overloading of domestic circuit?	2 Marks
14. Q. Why do we connect earth wire in house give two reason?	2 Marks
15.Q. Write four properties of magnetic field lines?	2 Marks

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X CBSE Physics Guess Paper Solved Ch.Magnetic effects of currents

1. A magnetic compass shows a deflection when placed near a current carrying wire. How will the deflection of the compass get affected if the current in the wire is increased? Support your answer with a reason.

Answer:   The deflection increases. The strength of magnetic field is directly proportional to the magnitude of current passing through the straight conductor.

2.  Meena draws magnetic field lines of field close to the axis of a current carrying circular loop. As she moves away from the centre of the circular loop she observes that the lines keep on diverging. How will you explain her observation

Answer:  Strength of the magnetic field falls as distance increases. This is I indicated by the decrease in degree of closeness of the lines of field.

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X- Guess Questions solved SA-1: Magnetic effects of currents

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X Magnetic effects of currents [Conceptual Question with solution)

Question:

Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field?

Solution:

Here , An electron beam, moving horizontally from back wall towards the front wall so, the direction of current will be in the opposite direction i.e. horizontally from front wall towards the back wall or towards us. The direction of the deflection of [EMF] is towards our right.

Let us use left hand Flemings rule: Adjust center finger point towards us (I) and thumb towards right side (EMF) then our forefinger will point in downward direction (MF)

Question:

A current through a horizontal power line flows in east to west direction. What is the direction of magnetic field at a point directly below it and at a point directly above it?

Solution

The current is in the east-west direction. Applying the right-hand thumb rule, we get that the direction of magnetic field at a point below the wire is from north to south. The direction of magnetic field at a point directly above the wire is from south to north

Question:

Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.

Solution

In the following diagram the current is flowing clockwise. If we are applying right hand thumb rule to the left side of the loop then the direction of magnetic field lines inside the loop are going into the table while outside the loop they are coming out of the table. If we are applying right hand thumb rule to the right side of the loop then the direction of magnetic field lines inside the loop are again going into the table while outside the loop they are coming out of the table.

Question:

A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is (a) towards south (b) towards east (c) downward (d) upward

Solution:

(d) Upward

Here, the positively-charged particle (alpha-particle) projected towards west, so the direction of current is towards west. The deflection is towards the north.

Let us use left hand Flemings rule: Adjust center finger towards west (I) and thumb towards north (EMF) then our forefinger will point in upward direction (MF)

MCQ-Physics Class X Magnetic effects of currents

Multiple Choice Questions : Physics Class X

MAGNETIC EFFECTS OF ELECTRIC CURRENT

1.A magnetic field can exert force on

(a)a moving magnet (b) stationary magnet  (c) moving charge (d)all of these

2.Magnetic lines of force

(a)have more directions                 (b)have no physical reality

(c)can be used to indicate the direction of the magnetic field of a point

(d)all the above

3. When is the back emf of an electric motor the greatest?

(a)when the motor is witched on

(b)when the motor is speeding up

(c)when the motor is at maximum speed

(d)when the motor is slowing down

4.According to international convention of color coding in a wire

(a)live is red, neutral is black and earth is green

(b) live is brown, neutral is blue and earth is green

(c) live is brown, neutral is green and earth is black

(d)live is red, neutral is yellow and earth is blue

5.An electric current can be produced in a closed loop

(a)by connecting it to a battery, but not by moving a magnet near it

(b)by moving a magnet near it, but not by connecting it to a battery

(c)by connecting it to a battery, as well as by moving a magnet near it

(d)neither by connecting it to battery nor by moving a magnet near it

6.Which of the following describes the common domestic power supplied in India?

(a)220V,100Hz                  (b)110V,100Hz

(c)220V,50Hz                    (d)110V,50Hz

7.Magnetic field due to a current carrying straight wire depends on

(a)current only                    (b)distance from the wire only

(c) both a) and (b)              (d)none

8.The direction of the magnetic field produced by a current carrying straight conductor can be found using

(a)right hand thumb rule          (b)right hand Fleming’s rule

(c)left hand Fleming’s rule         (d)right hand screw rule

9.A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each

(a)two revolution (b)one revolution  (c)half revolution (d)one-forth revolution

10.Electric motor

(a)is based on electromagnetic induction              (b)converts kinetic energy into electrical energy

(c)converts electric energy into kinetic energy     (d)none

11.To convert ac generator into dc generator

(a)split ring type commentator must be used   (b)slip rings and brushes must be used

(c)a stronger magnetic field has to be used     (d)a rectangular wire loop has to be used

12.Choose the incorrect statement

(a)The direction of magnetic field at a point is taken to be the direction in which north pole of magnetic compass needle points

(b)magnetic field lines are closed curves

(c)If magnetic field lines are parallel and equi distant, they represent zero field strength

(d)relative strength of magnetic field is shown by the degree of closeness of the field lines.

13.Force on a current conductor in a magnetic field depends on

(a)length of the conductor (b)current in the conductor

(c)magnitude of the magnetic field (d)all of these

14.Magnetic field inside a solenoid is

(a)non-uniform (b)circular

(c)uniform (d)none

15.Magnetic field lines due to a bar magnet is similar to that of a

(a)current carrying straight wire    (b) solenoid   (c) two parallel wires  (d)none

Physics X Magnetic effect of current CBSE Test paper-1

CBSE TEST PAPER -2012-13

Time: 1hr.  CHAPTER: MAGNETIC EFFECT OF CURRENT             FM: 30

1. A positively charged particle (alpha-particle) projected towards west is deflected towards north by magnetic field. The direction of magnetic field is

(a) towards south (b) towards east (c) downward (d) upward.

2. A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each

(a) two revolutions (b) one revolution (c) half revolution (d) one-fourth revolution.

3. Permanent magnets are made up of

(a) Alnico     (b) soft iron  (c) copper (d) aluminum.

4. Which of the following properties of a proton can change when it moves freely in a magnetic field

(a) Mass              (b) speed              (c) velocity           (d) momentum

5. The direction of the magnetic field at a point P above the wire carrying current is

(a) Down the page (b) up the page  (c) into the page   (d) out of the page

6. An alternating current has frequency of 50 Hz. How many times does it change its direction in one second?

7 . What is the advantage of the third wire of earth connection in domestic appliances?

8.  What is the S.I. unit of magnetic flux ?

Ans:  Weber : The magnetic flux linked with a surface is defined as the number of magnetic field lines passing normally through that surface.

9 . How can we increase the speed of a D.C. motor?

10. Why do not two magnetic field lines intersect each other?

11. What is a solenoid? Draw magnetic field lines showing the magnetic field inside and outside the current carrying solenoid?

12. (a) What is short circuiting? (b) What is overloading? How can you avoid overloading?

13. What are the ways to detect the polarity of a current carrying solenoid?

14. Consider a circular loop of wire lying in the plane of the table. let the current pass through the loop clockwise. Apply the right hand rule to find out the direction of magnetic field inside and outside the loop?

15. What is the orientation of a current caring conductor relative to the direction of magnetic field for

(a) Maximum magnetic force.              (b) Minimum magnetic force

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CBSE TEST PAPER -2012-13 Answers

CBSE PHYSICS: MAGNETIC EFFECTS OF ELECTRIC CURRENT FORMATIVE ASS...

CBSE PHYSICS: MAGNETIC EFFECTS OF ELECTRIC CURRENT FA-1
                                            

Questions Paper- I
MARKS-30		TIME- 70 MINUTES
Instructions:
Questions : 1 to 5 – 1 Mark each
Questions : 6 to 9 – 2 Marks each
Questions : 10 to 13 – 3 Marks each
Question 14 – 5 Marks
1. State two uses of permanent magnets.
2.  Does a neutron moving in a magnetic field experience a force. Why?
3.  State Fleming’s right hand rule.
4.  What are the functions of live and neutral wire in domestic circuit?
5.  Electricians wear rubber shoes while working. Why?
6.   Give four basic properties of magnets.
7.  Define SI unit of magnetic field. Under what condition does a moving charge experience                         i)   Maximum force  ii)  Minimum force
8. Draw toe field line around the bar magnet along its length on its two sides and mark the field directions on them by arrow marks.
9. Why do we use power supply of two different current rating at our home?
10. Write an activity to show that current carrying wire behaves like a magnet.
11.Match the following
A	B
i)  Electromagnet	a) Convert electric energy to mechanical energy
ii) Electric motor	b)  Convert mechanical energy to electrical energy
iii) Electric generator	c)  Strong magnet
12. Name three factors on which force produced due to magnetic field depends.
13.What is an electric fuse? What material is used for fuse wire?
14. a)      Write the principle of electric motor.
b) Explain the construction and working of electric motor briefly.
c) Draw a labelled diagram of electric motor.