Question

assertion: magnetic filed due to an infinite straight conductor varies inversely as th distance.

Reason: the magnetic field due to straight conductor is in the form of concentric circle​

Answer 1

Answer:

AIf both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

BIf both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion

CIf Assertion is true but Reason is false

DIf both Assertion and Reason are false

Solution:

The magnetic field at a point due to current flowing through an infinitely long conductor is given by

where  is the distance of that point from conductor. Now according to right hand thumb rule it follows that magnetic field is in the form of concentric circles, whose centres lie on the straight conductor.

Explanation:

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