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All India-2014
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Q7 of 30 Page 1

Why is the use of A.C. voltage preferred over D.C. voltage? Give two reasons.

The use of AC is preferred over DC voltage because: -


1. AC voltages can be easily stepped- down or stepped-up by using transformers which is not possible in DC voltages.


2. The transmission of AC power can done without much power loss in heating as compared to the DC voltages.


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The electric current flowing in a wire in the direction from B to A is decreasing. Find out the direction of the induced current in the metallic loop kept above the wire as shown.

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Why is it found experimentally difficult to detect neutrinos in nuclear β-decay?

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A biconvex lens made of a transparent material of refractive index 1.25 is immersed in water of refractive index 1.33. Will the lens behave as a converging or a diverging lens? Give reason.

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Using Rutherford model of the atom, derive the expression for the total energy of the electron in hydrogen atom. What is the significance of total negative energy possessed by the electron?

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Using Bohr's postulates of the atomic model derive the expression for radius of nth electron orbit. Hence obtain the expression for Bohr's radius.

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