two identical circular loops of metal wire are lying on a

Two identical circular loops of metal wire are lying on a table without touching each other. Loop-$$A$$ carries a current which increases with time. In response, the loop-$$B$$

A. remains stationary

B. is attracted by the loop-$$A$$

C. is repelled by the loop-$$A$$

D. rotates about its $$CM,$$ with $$CM$$ fixed

Answer : is repelled by the loop-$$A$$

Solution :
When the current in the loop $$A$$ increases, the magnetic lines of force in loop $$B$$ also increases as loop $$A$$ is placed near loop $$B.$$ This induces an emf in $$B$$ in such a direction that current flows opposite in $$B$$ (as compared to $$A$$).
Since currents are in opposite direction, the loop $$B$$ is repelled by loop $$A.$$
Electromagnetic Induction mcq solution image

Electromagnetic Induction mcq solution image

Releted MCQ Question on
Electrostatics and Magnetism >> Electromagnetic Induction

Releted Question 1

A thin circular ring of area $$A$$ is held perpendicular to a uniform magnetic field of induction $$B.$$ $$A$$ small cut is made in the ring and a galvanometer is connected across the ends such that the total resistance of the circuit is $$R.$$ When the ring is suddenly squeezed to zero area, the charge flowing through the galvanometer is

A. $$\frac{{BR}}{A}$$

B. $$\frac{{AB}}{R}$$

C. $$ABR$$

D. $$\frac{{{B^2}A}}{{{R^2}}}$$

View Answer

Releted Question 2

A thin semi-circular conducting ring of radius $$R$$ is falling with its plane vertical in horizontal magnetic induction $$\overrightarrow B .$$ At the position $$MNQ$$ the speed of the ring is $$v,$$ and the potential difference developed across the ring is

A. zero

B. $$\frac{{Bv\pi {R^2}}}{2}$$ and $$M$$ is at higher potential

C. $$\pi RBv$$ and $$Q$$ is at higher potential

D. $$2RBv$$ and $$Q$$ is at higher potential

View Answer

Releted Question 3