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The strength of the magnetic field aroun...

The strength of the magnetic field around a long straight wire, carrying current, is

A

inversely proportional to the distance from the wire

B

inversely proportional to the square of the distance from the wire

C

directly proportional to the square of the distance

D

directly proportional to the distance from the wire

Text Solution

Verified by Experts

The correct Answer is:
A
The magnetic field at a point at a distance r from the long straight wire carryiing current I is given by
`B=(mu_(0))/(4pi)(2I)/(r) or B prop(1)/(r)`
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    A
    is zero
    B
    decreases as we move towards its end
    C
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    D
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    B
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    D
    none of these

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    C
    increases as we move towards its end.
    D
    is the same at all points.

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