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Panchkula - 2015
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Q1 of 26 Page 1

In a series LCR circuit,. What is the value of power factor?

In LCR series circuit, the power dissipation is given the formula




Here is the power factor


Since VL =VC and XL = XC



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2

What happens when a forward bias is applied to a p-n junction?

3

Write a relation for polarisation of a dielectric material in the presence of an external electric field .

4

Define the term ‘mobility’ of charge carriers. Write its S.I. unit.

5

The focal length of an equiconvex lens is equal to the radius of curvature of either face. What is the refractive index of the material of the lens?

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