Magnetic Effects of Current Test Online MCQs

1. A proton and an α-particle, moving with the same velocity, enter a uniform magnetic field, acting normal to the plane of their motion. The ratio of the radii of the circular paths described by the proton and α-particle is:

2. A conducting ring of radius 1 meter is placed in an uniform magnetic field B of 0.01 teals oscillating with frequency 100 Hz with its plane at right angle to B. what will be the induced electric field?

3. An electron moving with kinetic energy 6.6 x 10⁻¹⁴ J enters in a magnetic field of 4 x 10⁻³ T at right angles to it. The radius of its circular path will be nearest to:

4. The cyclotron frequency of an electrons gyrating in a magnetic field of 1 T is approximately:

5. Two identical conductors of copper and aluminum are placed in an identical electric field. What is the magnitude of induced charge in the aluminum?

6. A solenoid is 1.5 m long and its inner diameter is 4.0 cm. it has 3 layers of winding of 1000 turns each and carries a current of 2.0 amperes. The magnetic flux for a cross-section of the solenoid is nearly

7. According to Lenz’s law there is a conversion of:

8. In a coil of self inductance of 5 Henry, the rate of change of current is 2 ampere per second, the e.m.f. induced in the coil is:

9. The magnetic flux through a circuit carrying a current of 2.0 A is 0.8 Weber. If the current reduces to 1.5 A in 0.1 s, the induced emf be:

10. A 50 turn circular coil has a radius of 3 cm, it is kept in a magnetic field acting normal to the area of the coil. The magnetic field B is increased from 0.10 T in 2 milli second, the average induced emf will be:

11. The current flows from A to B as shown in figure, then the direction of the induced current in the loop will be:

12. A coil of copper having 1000 turns is placed in a magnetic field (B=4 x 10⁻⁵) perpendicular to its axis. The cross sectional area of eh coil is 0.05 m². If it turns through 180° in 0.01 second, then the e.m.f. induced in the coil will be:

13. An electron is travelling along the x-direction. It encounters a magnetic field in the y-direction. Its subsequent motion will be:

14. The magnetic moment (μ) of a revolving electron around the nucleus varies with principal quantum number n as:

15. What is the magnetic field at a distance R from a coil of radius r carrying current I?