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ISC Class 12 Physics Solved Question Paper 2007

Short Answer Type

1. State Gauss’s theorem.

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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.

Given,

EMF of battery = 3.5V

Resistance of wire = 2.0 Ω

Area of cross section = 0.70 x 10^-6m²

Current comma space straight I space equals space straight V over straight R space equals space fraction numerator 3.5 over denominator 2 end fraction

I = 1.75 A

Current density, J = $straight I over straight A space equals space fraction numerator 1.75 over denominator 0.70 space x space 10 to the power of negative 6 end exponent space m squared end fraction$

i.e., J = 2.5 x 10⁶ A/m²

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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.

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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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