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If a copper ring is moved quickly towards south pole of a powerful stationary bar magnet, then
The magnetic flux linked with coil, in weber is given by the equation, $\varphi = 5{t^2} + 3t + 16$. The induced emf in the coil in the fourth second is
The coil of area 0.1 m2 has 500 turns. After placing the coil in a magnetic field of strength $4 \times {10^{ - 4}}Wb/{m^2}$, if rotated through 90o in 0.1 s, the average emf induced in the coil is
Magnetic flux in a circuit containing a coil of resistance $2\Omega $ changes from 2.0 Wb to 10 Wb in 0.2 sec. The charge passed through the coil in this time is
The diagram below shows two coils A and B placed parallel to each other at a very small distance. Coil A is connected to an ac supply. G is a very sensitive galvanometer. When the key is closed Question Image
An infinitely long cylinder is kept parallel to an uniform magnetic field B directed along positive z axis. The direction of induced current as seen from the z axis will be
In a magnetic field of 0.05T, area of a coil changes from $101\,c{m^2}$ to $100\,c{m^2}$ without changing the resistance which is $2\Omega$. The amount of charge that flow during this period is
If a coil of $40$ turns and area $4.0 cm^2$ is suddenly removed from a magnetic field, it is observed that a charge of $2.0 \times {10^{ - 4}}C$ flows into the coil. If the resistance of the coil is $80\Omega $, the magnetic flux density in $Wb/{m^2}$ is
A rectangular coil ABCD is rotated anticlockwise with a uniform angular velocity about the axis shown in diagram below. The axis of rotation of the coil as well as the magnetic field B are horizontal. The induced e.m.f. in the coil would be maximum when Question Image
A 10 metre wire kept in east-west falling with velocity $5 m/sec$ perpendicular to the field $0.3 imes {10^{ - 4}}Wb/{m^2}$. The induced e.m.f. across the terminal will be

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