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Q.

Two long wires are hanging freely. They are joined first in parallel and then in series and then are connected with a battery. In both cases, which type of force acts between the two wires        

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a

Attraction force when in parallel and repulsion force when in series

b

Repulsion force when in parallel and attraction force when in series

c

Attraction force in both cases

d

Repulsion force in both cases

answer is A.

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Detailed Solution

When connected in parallel the current will be in the same direction and when connected in series the current will be in the opposite direction.
 

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