Explanation:
The capacitance of a parallel plate capacitor is directly proportional to the area of the plates and permittivity of the medium between the plates. It is indirectly proportional to the distance between the plates.
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Maximum useable frequency (MUF) in F-region layer is x, when the critical frequency is 60 MHz and the angle of incidence is 70°. Then x is
|
(a) 150 MHz |
(b) 170 MHz |
(c) 175 MHz |
(d) 190 MHz |
A wire cd of length l and mass m is sliding without friction on conducting rails ax and by as shown. The vertical rails are connected to each other with a resistance R between a and b. A uniform magnetic field B is applied perpendicular to the plane abcd such that cd moves with a constant velocity of
|
(a) |
(b) |
(c) |
(d) |
Electric charges of +10μC, + 5μC, -3μC and +8 μC are placed at the corners of a square of side 
m. the potential at the centre of the square is
|
(a) 1.8 V |
(b) |
(c) 1.8 |
(d) 1.8 |
Cathode rays enter into a uniform magnetic field perpendicular to the direction of the field. In the magnetic field their path will be
|
(a) Straight line |
(b) Circle |
(c) Parabolic |
(d) Ellipse |
The energy liberated on complete fission of 1 kg of 
is (Assume 200 MeV energy is liberated on fission of 1 nucleus)
|
(a) 8.2 |
(b) 8.2 |
(c) 8.2 |
(d) 8.2 |
