1
###
An electron, a proton and an alpha particle having the same kinetic energy

An electron, a proton and an alpha particle having the same kinetic energy are moving in circular orbits of radii r_{e}, r_{p}, r_{α} respectively in a uniform magnetic field B. The relation between r_{e}, r_{p}, r_{α} is :

- r
_{e}< r_{p}= r_{α} - r
_{e}< r_{p}< r_{α} - r
_{e}< r_{α}< r_{p} - r
_{e}> r_{p}= r_{α}

2
###
If an electron and a proton having same momenta

If an electron and a proton having same momenta enter perpendicular to a magnetic field, then

- they will move undeflected
- curved path of electron and proton will be same (ignoring the sense of revolution)
- path of proton is more curved
- curved path of electron is more curved than that of the proton

3
###
The time period of a charged particle undergoing a circular motion

The time period of a charged particle undergoing a circular motion in a uniform magnetic field is independent of its

- mass
- magnetic induction
- charge
- speed

4
###
If in a circular coil A of radius R, current I is flowing and in another coil

If in a circular coil A of radius R, current I is flowing and in another coil B of radius 2R a current 2I is flowing, then the ratio of the magnetic fields B_{A} and B_{B}, produced by them will be

- 2
- 1/2
- 1
- 1/4

5
###
When current in a coil changes from 5 A to 2 A in 0.1 s, an average voltage of 50 V is produced

When current in a coil changes from 5 A to 2 A in 0.1 s, an average voltage of 50 V is produced. The self-inductance of the coil is:

- 0.67 H
- 1.67 H
- 3 H
- 6 H

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