Home
Class 12
PHYSICS
Figure shows a powerful electromagnet ar...

Figure shows a powerful electromagnet arrangement. A copper ring, which is free to move, is placed on the projecting part of the core as shown.
When the key is inserted, the ring

A

is thrown up

B

remains stationary

C

sticks to the core

D

slips down along the core

Text Solution

Verified by Experts

The correct Answer is:
A
Flux through teh ring increases in upward direction. To oppose the same, it is thrown up. As the ring moves up, intensity of magnetic field due to electromagnet at upper points is less since `B alpha((1)/(r^(3)))`.
Promotional Banner

Topper's Solved these Questions

  • MISCELLANEOUS VOLUME 5

    CENGAGE PHYSICS|Exercise Multiple Correct|34 Videos

  • MISCELLANEOUS VOLUME 5

    CENGAGE PHYSICS|Exercise Linked Comprehension|84 Videos

  • MISCELLANEOUS VOLUME 3

    CENGAGE PHYSICS|Exercise True and False|3 Videos

  • Moving charges and magnetism

    CENGAGE PHYSICS|Exercise Question Bank|20 Videos

Similar Questions

Explore conceptually related problems

A conducting ring is placed around the core of an electromagnet as shown in fig. qhen key K is pressed, the ring

A copper ring is tied to a string and suspended vertically. On bringing a magnet towards the coil, as shown in the figure-

The figure shows an electromagnetic train signal. When it is switched on, the signal remains in the upward position, whereas when it is switched off, the signal remains in the downward position as shown in the figure. Which part of the electromagnetic train signal is the electromagnet?

Show the Part of the image which man can see in the mirror as shown in the figure.

Figure shows a conducting frame having battery and a resistance on which a movable conductor of length 0.5 m can slide, The whole arrangement is placed in a uniform magnetic field of B =0.4 T directed perpendicular and into the plane of frame. Initially the circuit is open. When the key is inserted, the conductor begins to move. It is found that a force 0.5 N has to be applied on the conductor to the left to keep it moving at constant speed to the right. Current flowing in the conductor is:

In the arrangement shown in figure, there are two coils wound on a non-conducting cylindrical rod. Initially the key is not inserted. Then the key is inserted and later removed. Then:

If a copper ring is moved quickly towards south pole of a powerful stationary bar magnet, then

A metallic ring is attached horizontally with a wall. When a bar Magnet is passed through the ring from the top of the ring as shown in the figure. The induced current in the ring will be (as observed from above) IN S