41. The electric field due to a linear electric quadropole is inversely proportional to nth power of the distance. Here n is (1) 4 (3)-2 (2) 2 (4) -3 42. The classical radius of an electron is given by RA 2 Here value of constant 'A' is moc2 (here symbols have their usual meanings) 3 (1) (2) 20x 4 3 (3) (4) 43. A dielectric sphere (dielectric constant ) is placed in a uniform electric field E. The electric field inside the dielectric sphere is given by (1) E= (2) E= Eo 3 (3) E= E E +2 (4) E= E 44. The correct Claussius-Mossotti relation is- (symbols has their usual meaning) Na &,-1 4+1 (1) 30 &+2 (2) 3 & -2 Na &-2 -1 (3) = 30 &- 1 (4) 2 = 8, +3 45. Which one of the following statements is not true? (1) Maxwell's equations are non- linear. (2) Maxwell's equations include equation of continuity. (3) Maxwell's equations predict the existence of e.m. waves. (4) Maxwell's equations are not symmetric with respect to electric and magnetic fields.