Question

1. In case of Coulomb's law; F# (1/4τεο) (q1g/r') what should be the value of (1/4 mi? (a) 8.988 x 10° N-mIC (b) 8.854x10*C/N-m2 (c) 8.888 x 10 C2/N-m2 (d) None 2. The electric field (E) produced by a point charge (q) at a distance 'r is? (a) (4τεο) (qy2) (c1/r) (d) None Which is true for the electric field lines? (a) 3. They cross each other (b) They starts from-ve and ends at +ve charges (c) They measure electric field strength (d) Torque (t)due to electric dipole moment (p) is (a) (pxE)/2 (b) 2 (pxE) (c) pxE (d) None The potential energy (U) for an electric dipole in an electric field is? (a) pECos (b) pECos None 4. 5. (d) None Electric flux (D) is expressed as? (a) Ecos dA (b) EsinedA (c) JEtan dA (d) None 6. 7. At what stage you will get zero electric flux (D) (a) when the surface is face-on to the electric field (d-O) (b) When the surface is tilted from the face-on by an angle () (c) when the surface is edged-on to the electric field (9-90) (d) None of the above Gauss's law measures electric flux through a closed surface of charge (q) as (a) E.dA 2q/ 8. (d) None 9. Electric Field (E) at the Gaussian surface (r-2R) outside to a charged sphere (q) of radius R is (a) Es(1/4πε。) (a/2R2) (b) E: (1/4τεο) (a/4R2) (c) E-(/4)(q/16R') (d) None 10. Van de Graaff electrostatic generator is the best example for (a) Gauss's law (b) Faraday's Ice pail experiment (c) Both of the above (d) None

Answer 1