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Class 12th CBSE 2014 Physics Paper Set 2

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Class-12th CBSE
Subject- Physics Set 2
year-2014    

Here is some questions:-
1. Define the term 'electrical conductivity' of a metallic wire. Write its S.L unit.
2. Show variation of resistivity of Si with temperature in a graph.
3. A convex lens is placed in contact with a plane mirror. A point object at a distance of 20 cm on the axis of this combination has its image coinciding with itself. What is the focal length of the lens ?
4. "For any charge configuration, equipotential surface through a point is normal to the electric field." Justifu.

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