Physics

ICSE Class 12

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2.
What will be the net electric force acting on an electric dipole placed in a uniform electric field ?

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3.
Calculate the electric current density in a uniform wire connected to a battery of emf 3.5 V and negligible internal resistance. The resistance of the wire is 2.0 Ω and its area of cross section is 0.70 x 10^{-6} m.

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6.
Calculate the magnetic field (in SI unit) at the centre of a tangent galvanometer coil of 50 turns and radius 10 cm when a current of 1.0 A passes through it.

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7.
The SI unit of coefficient of inductance is henry. Using any defining equation for L or M show that 1 henery = 1 ohm second.

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8.
In a graphical variation of emf induced with time for the output of an AC generator, mark the peak value of emf induced and the time period.

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10.

The refractive indices of water, diamond and glass are 1.33, 2.0 and 1.5 respectively. In which of these will the speed of light be the maximum ? Justify your answer with a suitable reason.

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