Set-1
1.(i) Draw the pattern of the magnetic field lines of current carrying solenoid.
(ii) What does the pattern of the field lines inside the solenoid indicate?
(iii) Write one application of the current carrying solenoid.
(iii) Write one application of the current carrying solenoid.
2.A student performs an experiment to study magnetic effect of current around a current carrying conductor. He reports that –
i. For a given battery, the degree of closeness of a north pole decreases when the compass needle is kept at a point farther away from the conductor.
ii. The direction of deflection of north-pole of a compass needle kept at a given point near the conductor remains unaffected even when the terminals of the same battery sending current in the wire are interchange. Which of the above observations of the student appears to be wrong and why?
3. a. Explain the meaning of ‘electromagnetic’ and ‘induction’ in electromagnetic induction.
b. On what factors does the value of induced current produced in a circuit depend?
c. Name and state the rule used for determination of direction of induced current.
d. State one practical application of this phenomenon in everyday life.
4. a. Sketch magnetic field lines around a current carrying straight conductor.
b. What is meant by the term ‘frequency’ of alternating current? What is its value in India?
c. Why is AC considered to be advantageous over DC for long range transmission of electrical energy?
5. a. Why does a current carrying conductor kept in a magnetic field experiences force?
b. On what factors does the direction of this force depend?
c. Name and state the rule for the determination of direction of this force.
6. a. What is magnetic field? How can the direction of magnetic field lines at a place be determined?
b. State the rule for the direction of magnetic field produced around a current carrying conductor.
c. Draw sketch of field lines due to a current carrying straight conductor.
d. What is an electric fuse? What is its function in the circuit?
7. a. What is solenoid?
b. Draw a sketch of pattern of field lines of magnetic field through and around a current carrying solenoid.
c. 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.
8. a. When is the force experienced by a current carrying conductor placed in a magnetic field the largest?
b. State the rule which gives the direction of magnetic field associated with a current carrying conductor.
c. What will be the frequency of an AC, if the direction changes after every 0.02 second?
d. Complete an electric circuit to demonstrate that an electric current carrying wire behaves like a magnet. If a compass needle is placed near the wire, what happens to it on flowing current in the circuit? What happens, if the direction of the current is reversed?
9.a. What is a uniform magnetic field? Draw a diagram to represent uniform magnetic field.
b. A positively charged particle projected towards east is deflected towards north by magnetic field. What is the direction of magnetic field?
c. State the rule applied by you to find the answer of part (b).
10. Imagine you are sitting in a room with your back to one wall. An electron beam, moving horizontally from front wall towards the back wall, is deflected by a magnetic field to your right side. What is the direction of magnetic field? Name the rule applied. State the rule also.
11. Draw a labeled diagram of an electric motor. What is the function of a motor? Name three devices in which electric motors are used.
12. A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is
(i). Pushed into the coil, (ii). Withdrawn from inside the coil, (iii). Held stationary inside coil.
14. a. What is an electromagnet? State two ways, by which the strength of an electromagnet can be increased.
b. On what factors does the magnetic field produced at the centre of a current carrying circular loop depend?
c. State Flemming’s Right hand Rule. How does a solenoid behave like a bar magnet?
15. An electric motor of 2kW power rating is operated in a domestic electric circuit (220V) that has a current rating of 6A. What result do you expect? Give reasons.
Set-2
Q.1 What is ohm’s law? Give its mathematical expression? Draw the experimental setup also How much current will an electric heater coil draw from a 220 volt line, if the resistance of the heater coil is 40 Ω?
Q.2 What is electric current? Define 1A.
Q.3What is the SI unit of electric charge, power, electrostatic potential & Resistivity? Also define electrostatic potential at any point
Q.4 Name a device that helps to maintain potential difference across conductor.
Q.5 The length of the wire is doubled, what is the change in its resistively?
Q.6 why is tungsten used as filament in bulbs?
Q.7Determine the direction of conventional current
Q.8 Commercial unit of electrical energy is?
Q.9 Find the work done in moving a charge of 3 C across two points having potential 17V and 5V?
Q.10 Write few applications of heating effect of current.
Q. 11. R1 , R2 & R3 are three resisters connected in series . derive equivalent resistance for circuit. If value of two resistance are 10 Ω and 20 Ω , and a current of 5A flow through circuit having p.d 12v , find value of third resistor if all 3 are connected in parallel, also draw the schematic diagram. (3 mark)
Q. 12. State and derive joule’ s law. An electric iron consumes energy at rate of 840w when heating is at maximum rate and 360 w when heating is at minimum. The voltage is 220v . what are the current and resistant in each case?
Q. 13. Why inert gas such as nitrogen, filled in electric filament?
Q. 14. How many electrons are associated with (i) one coulomb of charge? (ii) The flow of current of 16mA for 100 s?
Q. 15. A torch bulb is rated at 3V and 600mA. Calculate it’s a) Power b) Resistance c) Energy consumed if it is lighted for 4 Hrs.
i. For a given battery, the degree of closeness of a north pole decreases when the compass needle is kept at a point farther away from the conductor.
ii. The direction of deflection of north-pole of a compass needle kept at a given point near the conductor remains unaffected even when the terminals of the same battery sending current in the wire are interchange. Which of the above observations of the student appears to be wrong and why?
3. a. Explain the meaning of ‘electromagnetic’ and ‘induction’ in electromagnetic induction.
b. On what factors does the value of induced current produced in a circuit depend?
c. Name and state the rule used for determination of direction of induced current.
d. State one practical application of this phenomenon in everyday life.
4. a. Sketch magnetic field lines around a current carrying straight conductor.
b. What is meant by the term ‘frequency’ of alternating current? What is its value in India?
c. Why is AC considered to be advantageous over DC for long range transmission of electrical energy?
5. a. Why does a current carrying conductor kept in a magnetic field experiences force?
b. On what factors does the direction of this force depend?
c. Name and state the rule for the determination of direction of this force.
6. a. What is magnetic field? How can the direction of magnetic field lines at a place be determined?
b. State the rule for the direction of magnetic field produced around a current carrying conductor.
c. Draw sketch of field lines due to a current carrying straight conductor.
d. What is an electric fuse? What is its function in the circuit?
7. a. What is solenoid?
b. Draw a sketch of pattern of field lines of magnetic field through and around a current carrying solenoid.
c. 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.
8. a. When is the force experienced by a current carrying conductor placed in a magnetic field the largest?
b. State the rule which gives the direction of magnetic field associated with a current carrying conductor.
c. What will be the frequency of an AC, if the direction changes after every 0.02 second?
d. Complete an electric circuit to demonstrate that an electric current carrying wire behaves like a magnet. If a compass needle is placed near the wire, what happens to it on flowing current in the circuit? What happens, if the direction of the current is reversed?
9.a. What is a uniform magnetic field? Draw a diagram to represent uniform magnetic field.
b. A positively charged particle projected towards east is deflected towards north by magnetic field. What is the direction of magnetic field?
c. State the rule applied by you to find the answer of part (b).
d. Describe an activity to show, how you can make an electromagnet in your school library.
10. Imagine you are sitting in a room with your back to one wall. An electron beam, moving horizontally from front wall towards the back wall, is deflected by a magnetic field to your right side. What is the direction of magnetic field? Name the rule applied. State the rule also.
11. Draw a labeled diagram of an electric motor. What is the function of a motor? Name three devices in which electric motors are used.
12. A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is
(i). Pushed into the coil, (ii). Withdrawn from inside the coil, (iii). Held stationary inside coil.
13. a. Name any one device which gives i. Direct current ii. Alternating current.
b. An alternating current has a frequency of 50Hz. How many times does it change its direction in 1 second?
b. An alternating current has a frequency of 50Hz. How many times does it change its direction in 1 second?
c. A current through a horizontal power line flows in east to west direction. What is direction of magnetic field i. at a point directly below it? ii. at a point directly above it.
14. a. What is an electromagnet? State two ways, by which the strength of an electromagnet can be increased.
b. On what factors does the magnetic field produced at the centre of a current carrying circular loop depend?
c. State Flemming’s Right hand Rule. How does a solenoid behave like a bar magnet?
15. An electric motor of 2kW power rating is operated in a domestic electric circuit (220V) that has a current rating of 6A. What result do you expect? Give reasons.
Set-2
Q.1 What is ohm’s law? Give its mathematical expression? Draw the experimental setup also How much current will an electric heater coil draw from a 220 volt line, if the resistance of the heater coil is 40 Ω?
Q.2 What is electric current? Define 1A.
Q.3What is the SI unit of electric charge, power, electrostatic potential & Resistivity? Also define electrostatic potential at any point
Q.4 Name a device that helps to maintain potential difference across conductor.
Q.5 The length of the wire is doubled, what is the change in its resistively?
Q.6 why is tungsten used as filament in bulbs?
Q.7Determine the direction of conventional current
Q.8 Commercial unit of electrical energy is?
Q.9 Find the work done in moving a charge of 3 C across two points having potential 17V and 5V?
Q.10 Write few applications of heating effect of current.
Q. 11. R1 , R2 & R3 are three resisters connected in series . derive equivalent resistance for circuit. If value of two resistance are 10 Ω and 20 Ω , and a current of 5A flow through circuit having p.d 12v , find value of third resistor if all 3 are connected in parallel, also draw the schematic diagram. (3 mark)
Q. 12. State and derive joule’ s law. An electric iron consumes energy at rate of 840w when heating is at maximum rate and 360 w when heating is at minimum. The voltage is 220v . what are the current and resistant in each case?
Q. 13. Why inert gas such as nitrogen, filled in electric filament?
Q. 14. How many electrons are associated with (i) one coulomb of charge? (ii) The flow of current of 16mA for 100 s?
Q. 15. A torch bulb is rated at 3V and 600mA. Calculate it’s a) Power b) Resistance c) Energy consumed if it is lighted for 4 Hrs.
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