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A rectangular loop of wire, supporting a mass m, hangs with one end in a uniform magnetic filed \overrightarrow{B}pointing out of the plane of the paper. A clockwise current is set up such that i> mg/Ba, where a is the width of the loop. Then: 

Option: 1

The weight rises due to a vertical force caused by the magnetic field and work is done on the system.


Option: 2

The weight do not rise due to vertical for caused by the magnetic field and work is done on the system.


Option: 3

The weight rises due to a vertical force caused by the magnetic field but no work is done on the system.


Option: 4

The weight rises due to a vertical force caused by the magnetic field and work is extracted from the magnetic field.


Answers (1)

best_answer

Force due to B on PQ is given as

F=IBa

and it is in vertically upward direction

and  i> mg/Ba

so F> mg 

So 

The weight rises due to a vertical force caused by the magnetic field.

 

Posted by

Rishi

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