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A long, straight wire is turned into a l...

A long, straight wire is turned into a loop of radius 10 cm (see figure) If a current of 8 amperes is passed through the loop, then the value of the magnetic field and its direction at the centre C of the loop shall be close to

A

`5.0 xx 10^(-5)` Newton (amp-meter) , upward

B

`3.4 xx 10^(-5)` Newton (amp-meter ) , upward

C

`1.6 xx 10^(-5)` Newton (amp-meter) , downward

D

`1.6 xx 10^(-5)` Newton (amp-meter) , upward

Text Solution

Verified by Experts

The correct Answer is:
A
`B = (mu_(0) I)/(2R) = (4pi xx 10^(-7) xx 8)/(2 xx 0.1)`
`= 5.024 xx 10^(-5)` N/Amp - meter (upward)
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