The coil of a tangent galvonometer of radius 12cm is having 200turns. If the forinzontal component of earth's magnetic field is `25muT`. Find the current which gives a deflection of `60^(@)`.
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Given, r=radius of coil=12cm=0.12m, N=Number of turns of coil=200, H=`25muT=25xx10^(-6)T` and `phi=60^(@)` As we know, `I=K tan theata` where, `k=(2rH)/(mu_(0)N)` `therefore " " I=(2rH)/(mu_(0)N) tan theta` `" " =(2xx0.12xx25xx10^(-6)xxtan60^(@))/(4pixx10^(-7)xx200)` =0.042A
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