Physics Test 17

Result

Physics Test 17

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Question 1
4 / -1

A coil is suspended in a uniform magnetic field, with the plane of the coil parallel to the magnetic lines of force. When a current is passed through the coil it starts oscillating; it is very difficult to stop. But if an aluminium plate is placed near to the coil, is stops. This is due to

A
development of air current when the plate is placed

B
induction of electrical charge on the plate

C
shielding of magnetic lines of force as aluminium is a paramagnetic material

D
electromagnetic induction in the aluminium plate giving rise to electromagnetic damping

Solution

Oscillating coil produces time variable magnetic field. If cause eddy current in the aluminium plate which causes anti-torque on the coil, due to which is stops.
Question 2
4 / -1

Arrange the following electromagnetic radiations per quantum in the order of increasing energy:
A : Blue light
B : Yellow light
C : X-ray
D : Radiowave

A
C, A, B, D

B
B, A, D, C

C
D, B, A, C

D
A, B, D, C

Solution

Radio waves have a lower energy that visible. Hence D has least energy. X rays have higher energy than visible hence C has highest. In the visible range, the sequence of decreasing energy is given by VIBGYOR. Hence yellow has lesser energy than blue.