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.
A sphere of 4 cm radius is suspended within a hollow sphere of 6 cm radius. The inner sphere is charged to potential 3 e.s.u. and the outer sphere is earthed. The charge on the inner sphere is
|
(a) 54 e.s.u. |
(b) |
(c) 30 e.s.u. |
(d) 36 e.s.u. |
If 
is the intensity of the principal maximum in the single slit diffraction pattern, then what will be its intensity when the slit width is doubled
|
(a) |
(b) |
(c) 2 |
(d) 4 |
The sun makes 0.5o angle on earth surface. Its image is made by convex lens of 50 cm focal length. The diameter of the image will be
|
(a) 5 mm |
(b) 4.36 mm |
(c) 7 mm |
(d) None of these |
Assertion : At 0 K Germanium is a superconductor.
Reason : At 0 K Germanium offers zero resistance.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
An electric dipole is situated in an electric field of uniform intensity E whose dipole moment is p and moment of inertia is I. If the dipole is displaced slightly from the equilibrium position, then the angular frequency of its oscillations is
|
(a) |
(b) |
(c) |
(d) |
A light source approaches the observer with velocity 0.8 c. The doppler shift for the light of wavelength 5500 Å is
|
(a) 4400 Å |
(b) 1833 Å |
(c) 3167 Å |
(d) 7333 Å |
