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 Question 1. Dielectric strength of a medium is 2 KV mm-1. What is the maximum potential difference that can be set up across a 50 µm specimen without puncturing it. (a) 10 V (b) 100 V (c) 1000 V (d) 10,000 V Answer Answer: (b) 100 V Question 2. A charge q is distributed over two spheres of radii r1 and r2 such that their surface densities are equal. What is the ratio of their potential. (a) r1:r2 (b) r²1:r²2 (c) r³1:r³2 (d) none of these Answer Answer: (a) r1:r2 Question 3. A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V. The potential at a distance of 2 cm from the centre of sphere is: (a) Zero (b) 10 V (c) 5 V (d) 103 V Answer Answer: (b) 10 V Question 4. Electric potential V due to an electric dipole is related to the distance r of the observation point as: (a) V ∝ r (b) V ∝ r-¹ (c) V ∝ r² (d) V ∝ r-² Answer Answer: (d) V ∝ r-² Question 5. Two insulated charged spheres of radii 20 cm and 25 cm respectively and having an equal charg...