Magnetism

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

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

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

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

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