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Electric current is measured by tangent galvonometer, the current being proportional to the tangent of the angles `theta` of deflection. If the deflection is read as `45^(@)` and an error of 1% is made in reading it then the percentage error in the current is

A

`pi`

B

`(pi)/(2)`

C

`(pi)/(3)`

D

`(pi)/(4)`

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The correct Answer is:
B
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