A rectangular coil ABCD is hung from one side of a balance … | CGP Edu

Physics Moving Charge and Magnetism Mix MCQ (Single Correct)

A rectangular coil ABCD is hung from one side of a balance as shown in figure. A 500 g mass is added to the other arm to balance the weight of the coil. A current of 9.8 A is passed through the coil and a constant magnetic field of 0.4 T acting inward (in xz plane) is switched on such that only arm CD of length 1.5 cm lies in the field. The additional mass m must be added to regain the balance is

A

4 g

B

5 g

C

6 g

D

7 g

Text Solution

Verified by Experts

The correct answer is:

In absence of magnetic field the weight added in one pan balances the rectangular coil in the other pan of balance,

or

When current I is passed through the coil and the magnetic field is switched on

Let m mass added in the first pan to regain the balance then

Or

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