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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. Identify the expression for the magnetic field on the axis of circular loop.
2. 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?
3. How is galvanometer converted into a voltmeter?
4. 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.
5. 'X' is the product of the pole strength of either magnetic pole and the magnetic length of the magnetic dipole. Identify X.
6. An electron moving with a velocity of 15 ms-1 enters a uniform magnetic field of 0.2 T, along a direction parallel to the field. What would be its trajectory in this field?
7. There are 2 long parallel conductors AB and CD. AB carries 4A current and CD carries 3A current. The magnetic field at the midpoint of these 2 conductors is B. If 4A current is switched off, then what is the magnetic field at the midpoint now?
8. When a charge moves parallel or antiparallel to the direction of the magnetic field, it experiences a maximum force. State true or false.
9. 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?
10. 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.
11. A horizontal overhead power line carries a current of 100A in east to west direction. What is the magnitude and direction of the magnetic field due to the current, 2 m below the line?
12. What is the value of the shunt resistance (S) required if a galvanometer has a resistance f 50 Ω and a maximum of 0.05A current that can be passed through it? The ammeter range is changed to 20 A.
13. A moving coil galvanometer has the following characteristics – Number of turns of coil = 50; Area of coil = 70 mm2; Resistance of coil = 30 Ω; Flux density of radial field = 0.1 T; Torsional constant of suspension wire = 7 × 10-8 N m/rad. Calculate the current and voltage sensitivity.
14. What is moving coil galvanometer used for?
15. 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.
16. Give the SI unit of magnetic permeability of free space.
17. Which of the following will experience a maximum force, when projected with the same velocity perpendicular to the magnetic field : (i) α-particle, and (ii) β-particle?
18. Pick out the expression for magnetic field inside a toroid from the following.
19. Pick out the expression for galvanometer constant from the following?
20. A galvanometer has resistance of 10 ohms and a full scale deflection is produced by 5 milli amperes. What is the value of resistance that should be connected in series with it in order to enable it to read 2V?
21. 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.
22. What is the expression for the force experienced by two parallel current carrying conductors of unequal length?
23. 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?
24. How is a galvanometer converted into an ammeter?
25. 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?

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