Question

The coil of a galvanometer is $0.02 \mathrm{~m} 	imes 0.08 \mathrm{~m}$ It consists of 200 turns of fine wire and is in a magnetic field of 0.2 tesla. The restoring torque constant of the suspension fibre is $10^{-6} \mathrm{Nm} \mathrm{~deg}^{-1}$. Assuming the magnetic field to be radial, (a) what is the maximum current that can be measured by this galvanometer, if the scale can accommodate $30^{\circ}$ deflection ? (b) What is the smallest current that can be detected, if the minimum observable deflection is 0.1 degree?

Accepted Answer

$4.69 	imes 10^{-4} \mathrm{~A};\,\,1.56	imes10^{-6}\mathrm{~A}$

Answer

$4.96 	imes 10^{-4} \mathrm{~A};\,\,1.65	imes10^{-6}\mathrm{~A}$

Answer

$5.69 	imes 10^{-4} \mathrm{~A};\,\,2.56	imes10^{-6}\mathrm{~A}$

Answer

$3.69 	imes 10^{-4} \mathrm{~A};\,\,3.56	imes10^{-6}\mathrm{~A}$

JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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