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Question

A very long straight wire of radius r carries current I. Intensity of magnetic field B at a point, lying at a perpendicular distance 'a' from the axis is ___________.

A
a2
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B
1/a2
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C
1/a
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D
a
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Solution

The correct option is C 1/a
Magnetic field due to a very long straight wire at a point lying perpendicular distance a from the axis
B=μoI2πa
B1a
Correct answer is option C.

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