Explanation:
There is no effect of the metal on the external electric field(thus A is incorrect) while the dielectric reduces the net electric field outside. The dielectric produces an electric field inside it due to the induced charges which is opposite to the external field. Thus EQ is reduced and B and C are also incorrect.(Note that EP is not the external field). Now as the electric field inside the conductor is zero, the field Ep is zero if X is a metallic.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Force between two identical bar magnets whose centres are r metre apart is 4.8 N, when their axes are in the same line. If separation is increased to 2r, the force between them is reduced to
|
(a) 2.4N |
(b) 1.2N |
(c) 0.6N |
(d) 0.3N |
Wavefront means
|
(a) All particles in it have same phase |
|
(b) All particles have opposite phase of vibrations(c) Few particles are in same phase, rest are in opposite phase |
|
(c) Few particles are in same phase, rest are in opposite phase |
|
(d) None of these |
Polarised glass is used in sun glasses because
|
(a) It reduces the light intensity to half an account of polarisation |
|
(b) It is fashionable |
|
(c) It has good colour |
|
(d) It is cheaper |
