Magnetic effects of current Test

Result

Magnetic effects of current Test - 2

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Question 1
1 / -0

An electron and a proton enter a magnetic field with equal velocities. Which one of them experiences more force?

A
Electron

B
Proton

C
Cannot be predicted

D
Both experience the same force

Solution

The force on a moving charge due to the magnetic field is given by F = qvB sinθ.
The magnitude of the charge on the electron and the proton is the same and both are movingwith equal velocities. Therefore, magnitude of the force acting on them will be the same.
Question 2
1 / -0

Magnetism in a magnet is mainly due to

A
orbital motion of the electrons

B
the spin motion

C
the nuclear charge

D
nucleus density

Solution

Magnetism in the magnet is mainly due to the spin motion of the electrons. The magnetic moment consists of two distinct sources. The electron is a particle, which has its own spin which can take on values of ± 1/2 ħ. The nucleus also has protons and neutrons, which have their own intrinsic spins. However, the magnetic moment is inversely proportional to the mass. So, in comparison with the electron, the magnetic moment of the nucleus is minimal.There is also a contribution to the magnetic moment produced by the electrons moving around the nucleus can be considered to act as a current loop. The magnitude of the magnetic moment is related to the angular momentum of the electron travelling around the nucleus.
Question 3
1 / -0

The two ends of a horizontal conducting rod of length l are joined to a voltmeter. The whole arrangement moves with a horizontal velocity u, the direction of motion being perpendicular to the rod. The vertical component of earth's magnetic field is B. The voltmeter reading is .....

A
Blv only if the rod moves eastward

B
Blv only if the rod moves westward

C
Blv only if the rod moves in any direction

D
zero

Solution

According to Faraday's laws, emf induced across the conducting rod is given by e = Blvsinθ, where θ is the angle between the direction of the magnetic field and the velocity of the rod. Here the direction of the magnetic field is vertically downwards, so if the rod is moving eastward or westward or in any direction in the horizontal plane perpendicular to the direction of the magnetic field, emf is induced.