1.

A 800 turn coil of effective area 0.05 m^2 is kept perpendicular to a magnetic field 5 xx 10^(-5) T. When the plane of the coil is rotated by 90^@around any of its coplanar axis in 0.1 s, the emf induced in the coil will be

Answer»

0.02 V
2 V
0.2 V
`2XX10^(-3)` V

Solution :Here , N=800 ,`A=0.05 m^2 , B=5xx10^(-5)` T , `Deltat=0.1xxs^(-1)`
Induced emf ,
`E=(-N phi_2-phi_1)/(Deltat) =(-N(AB cos 90^@ -AB cos 0^@)/(Deltat)`
`=-(N(0-AB))/(Deltat)=(NAB)/(Deltat)`
`=(800xx0.05xx5xx10^(-5))/0.1`
`=2xx10^(-2)` V
=0.02 V


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