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Class 12 Physics: Moving Charges and Magnetism
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MCQs on magnetic force, magnetic field motion, electric and magnetic field motion, biot savart law, amperes circuital law, solenoid and toroid, two parallel currents forces, moving coil galvanometer, current loop and magnetic dipole torque.

Class 12 Physics: Moving Charges and Magnetism
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25 Questions

1. A wire placed along the north-south direction carries a current of 8 A from south to north. Find the magnetic field due to a 1 cm piece of wire at a point 200 cm north-east from the piece.
2. The current passing through a galvanometer is 30 mA, resistance of the galvanometer is 50 Ω and a shunt is 1 Ω is connected to the galvanometer. What is the maximum current that can be measured by this ammeter?
3. Pick out the expression for magnetic field inside a toroid from the following.
4. The magnetic field due to a current element is minimum in a plane passing through the element when it is perpendicular to its axis. State true or false.
5. In a cyclotron, a magnetic induction of 1.4 T is used to accelerate protons. How rapidly should the electric field between the dees be reversed?
6. Give the SI unit of the magnetic field.
7. What should be the minimum magnitude of the magnetic field that must be produced at the equator of earth so that a proton may go round the earth with a speed of 1 × 107 ms-1? Earth's radius is 6.4 × 106 m.
8. If an electron entering at a magnetic field of 2 × 10-2 T has a velocity of 3 × 107 ms-1 and describes a circle of radius 8 × 10-3 m, then find the value of \(\frac {e}{m}\) of the electron.
9. Two concentric coils of 20 turns each are situated in the same plane. Their radii are 60 cm and 80 cm and they carry currents 0.4 A and 0.5 A respectively in opposite directions. Calculate the magnetic field at the center.
10. What torque acts on a 50 turn coil of 200 cm2 area carrying a current of 20 A held with its axis at right angles to a uniform magnetic field of 0.2T?
11. Pick out the expression for magnetic field strength at any point at the center of a circular loop from the following?
12. A rectangular coil, of sides 4 cm and 5 cm respectively, has 50 turns in it. It carries a current of 2 A, and is placed in a uniform magnetic field of 0.5 T in such a manner that its plane makes an angle of 60o with the field direction. Calculate the torque on the loop.
13. What should be the value of shunt resistance of the ammeter in order to increase its range?
14. Find the true statement.
15. Identify the expression for ampere's circuital law from the following?
16. Give the SI unit of magnetic pole strength.
17. Identify the expression for the magnetic field on the axis of circular loop.
18. Pick out the expression for force per unit length between two parallel carrying conductors if the current passing through both of them are the same?
19. A proton enters a magnetic field of flux density 5 T with a velocity of 5 × 107 ms-1 at an angle of 30o with the field. Find the force on the proton.
20. Calculate the torque on a 500 turn rectangular coil of length 20 cm and breadth 10 cm, carrying a current of 30 A, when placed making an angle of 60o with a magnetic field of 0.5 T?
21. Calculate the speed of an electron if it travels in a circular path of radius 50 cm in a magnetic field of 5 × 10-3 T.
22. Two long conductors, separated by a distance r carry current I1 and I2 in the same direction. They exert a force F on each other. Now, the current in one them is increased to 3 times and the direction is reversed. The distance is also increased to 5r. What is the new value of the force between them?
23. Pick out the expression for galvanometer constant from the following?
24. The galvanometer shown below has a resistance (RG) of 50.00 Ω. Now, this galvanometer is converted to an ammeter with the help of a shunt resistance (rS) of 0.05 Ω. Calculate the current passing through the galvanometer in both the cases.
25. The frequency of revolution of a charged particle in a cyclotron does not depend on 'X'. Identify X.

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