Question

Three coils are placed in front of each other as shown. Current 1 and 2 are in the same direction, while in 3 is in the opposite direction. Match the following table

Table 1	Table - 2
(a) When the current in 1 is increased	(p) current in 1 will increased i
(b) When the current in 2 is increase	(q) current in 2 will increased
(c) When the current in 3 is increased	(r)Current in 3 will increase

• A. a-r; b-r; c-p,q
• B. a-p; b-p; c-q
• C. a-q; b-q; c-r
• D. a-r; b-q; c-p

Answer 1

The correct option is A a-r; b-r; c-p,q

We know that in the loops the current will change so as to minimize the effect of a change in flux linked with that particular loop.

$Case-1:$ When current in loop-1 is increased, current in loop-2 having the same direction as loop-1 will decrease and current in loop-3 having the opposite direction of current will increase so as to diminish the effect of a change in magnetic flux.

$Case-2:$ When current in loop-2 is increased, current in loop-1 having the same direction as loop-2 will decrease and current in loop-3 having the opposite direction of current will increase so as to diminish the effect of a change in magnetic flux linked with it.

$Case-3:$ When current in loop-3 is increased, current in both loop-2 and loop-3 will increase so as to diminish the effect of a change in magnetic flux.

Hence, the answer is option-(A).