Q.

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R). 

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a

Both (A) and (R) are true but (R) is not the correct explanation of (A)

b

Both (A) and (R) are true and (R) is the correct explanation of (A)

c

Both (A) and (R) are false

d

(A) is true but (R) is false

answer is B.

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Detailed Solution

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Two parallel conductors carrying current in same direction attract each other while repel each other when the currents through them is in opposite directions.

In a solenoid, current flow in same direction in adjacent loops. So, they will attract each other, and it will cause the solenoid to contract.

Magnetic field lines due to individual coils of a solenoid add up inside the solenoid and form a uniform magnetic field inside it.

Both statements are true and independent.

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