Magnetic Effects of Current Test

Result

Magnetic Effects of Current Test - 5

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Question 1
1 / -0

A direct current is sent through a helical wire coil or spring. The coil

A
tends to get shorter

B
tends to get longer

C
tends to rotate about its axis

D
None of these

Solution

If a direct current is sent through a helical wire coil, the sense of the current in the adjacent turns will be the same. We know that parallel currents attract each other, so the coil will tend to get shorter.
Question 2
1 / -0

A beam of electrons passes undeflected through mutually perpendicular electric and magnetic fields. If the electric field is switched off and the same magnetic field is maintained, the electrons move

A
in an elliptical orbit

B
in a circular orbit

C
along a parabolic path

D
along a straight line

Solution

If the electric field is switched off and the same magnetic field is maintained, the electrons will move in a circular orbit as the force due to the magnetic field is always perpendicular to the velocity vector and the direction of the magnetic field.