Question

A vertical conducting ring of radius R falls vertically in horizontal uniform magnetic field of magnitude B. The direction of B is $\otimes$ . When the speed of the ring is v

• A. no current flows in the ring.
• B. A & B are at the same potential
• C. C & E are at the same potential
• D. the potential difference between A & D is 2BRv, with D at a higher potential

Answer 1

The correct option is A no current flows in the ring.

$ϵ=\frac{△{\varphi }_B}{△t}$

Now, ${\varphi }_B=Bvl\cos \theta$

$\theta \to$ angle between $B$ and $v.$

Here $\theta =90°=0$

$\therefore {\varphi }_B=Bvl\cos 90°=0$

$\therefore ϵ=\frac{△{\varphi }_B}{△t}=0$

$\therefore I=0$

No current flows in the ring.

Hence, the answer is no current flow of ring.