- Ais higher at the closer end.
- Bis non-uniform.
- CIs higher at inclined plate.
- DIs uniform.
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The capacitance of an air capacitor is 15 μF the separation between the parallel plates is 6mm. A copper plate of 3mm thickness is introduced symmetrically between the plates. The capacitance now becomes
|
(a) 5 μF |
(b) 7.5 μF |
(c) 22.5 μF |
(d) 30 μF |
The resistance of a discharge tube is
|
(a) Ohmic |
(b) Non-ohmic |
(c) Both (a) and (b) |
(d) Zero |
X-rays can be used to study crystal structure, if the wavelength lies in the range
| (a) 2 Å to 0.1 Å | (b) 10 Å to 5 Å | (c) 50 Å to 10 Å | (d) 100 Å to 50 Å |
A double convex lens (
having focal length equal to the focal length of a concave mirror. The radius of curvature of the concave mirror is
|
(a) 10 cm |
(b) 20 cm |
(c) 40 cm |
(d) 15 cm |
Energy required to remove an electron from aluminium surface is 4.2 eV. If light of wavelength 2000 Å falls on the surface, the velocity of the fastest electron ejected from the surface will be
|
(a) 8.4 |
(b) 7.4 |
(c) 6.4 |
(d) 8.4 |