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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. Which of the following is not a point of similarity between Biot-Savart law and Coulomb’s law.
2. Pick out the expression for galvanometer constant from the following?
3. Pick out the expression for magnetic field inside a toroid from the following.
4. A positive charge is moving vertically upwards. When it enters a region of magnetic field directed towards north, what is the direction of the force on the charge?
5. When 0.010A current flows through a moving coil galvanometer, it gives full deflection. Then, it is converted into a voltmeter which gives a reading of 10 V using an external resistance of 950 Ω. What is the resistance of the galvanometer (G)?
6. Identify the factor on which the torque on a planar current loop does not depend.
7. How is galvanometer converted into a voltmeter?
8. A solenoid of 0.5 m length with 100 turns carries a current of 5 A. A coil of 20 turns and of radius 0.02m carries a current of 0.6 A. What is the torque required to hold the coil with its axis at right angle to that of solenoid in the middle point of it?
9. Identify the condition under which the force acting on a charge moving through a uniform magnetic field is minimum.
10. 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?
11. Give the SI unit of magnetic permeability of free space.
12. Alpha particles of mass 6.68 × 10-27 Kg and charge 3.2 × 10-19 C is accelerated in a cyclotron in which a magnetic field of 1.25 T is applied perpendicular to the dees. How rapidly should the electric field between the dees be reversed?
13. Find the true statement.
14. Which of the following particles cannot be accelerated using a cyclotron?
15. 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.
16. Identify the expression for ampere's circuital law from the following?
17. Which one of the following graphs depict the magnetic field B at a distance r from a long straight wire carrying current varies with distance r?
18. 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?
19. A cyclotron has an oscillatory frequency of 12 MHz and a dee radius of 50 cm. Calculate the magnetic field required to accelerate deuterons of mass 3.3 × 10-27 Kg and charge 1.6 × 10-19 C.
20. Give the dimensional formula for magnetic permeability of free space.
21. The frequency of revolution of a charged particle in a cyclotron does not depend on 'X'. Identify X.
22. 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.
23. A long solenoid has 500 turns per cm and carries a current I. The magnetic field at its center is 7.54 × 10-2 Wb m-2. Another long solenoid has 300 turns per cm and it carries a current \(\frac {I}{3}\). What is the value of magnetic field at the center?
24. Pick out the expression for magnetic field strength at any point at the center of a circular loop from the following?
25. In a galvanometer 15% of the total current in the circuit passes through it. If the resistance of the galvanometer is G, then find out the shunt resistance S that is connected to the galvanometer.

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