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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4.Name the two conservation laws implied in Kirchoffs laws for electric circuits.
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5.Write in vector form, the defining equation for a magnetic field B at a point.
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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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9.Mention any two uses of geostationary satellites.
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.
The refractive index of a material is given by,
Since c is constant,
Refractive index of water is 1.33, 2.0 and 1.5.
Longer the refractive index lesser is the velocity of light hence, velocity of light is maximum in water (1.33).
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