- AInsulators.
- BConductors.
- CSemiconductors.
- DSuperconductors.
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The number of turns in the coil of an ac generator is 5000 and the area of the coil is
. The coil is rotated at the rate of 100 cycles/sec in a magnetic field of 0.2
. The peak value of the emf generated is nearly
|
(a) 786 kV |
(b) 440 kV |
(c) 220 kV |
(d) 157.1 kV |
In a single slit diffraction experiment first minimum for red light (660 nm) coincides with first maximum of some other wavelength l'. The value of l' is
|
(a) 4400 Å |
(b) 6600 Å |
(c) 2000 Å |
(d) 3500 Å |
In Fresnel’s biprism experiment, on increasing the prism angle, fringe width will
|
(a) Increase |
(b) Decrease |
|
(c) Remain unchanged |
(d) Depend on the position of object |
White light is passed through a prism whose angle is 5°. If the refractive indices for rays of red and blue colour are respectively 1.64 and 1.66, the angle of deviation between the two colours will be
|
(a) 0.1 degree |
(b) 0.2 degree |
(c) 0.3 degree |
(d) 0.4 degree |
The electric field at a point on equatorial line of a dipole and direction of the dipole moment
|
(a) Will be parallel |
(b) Will be in opposite direction |
|
(c) Will be perpendicular |
(d) Are not related |
The resistance of a germanium junction diode whose V - I is shown in figure is
| (a) 5 kW | (b) 0.2 kW | (c) 2.3 kW |
(d) |
A planet of mass m moves in an ellipse around the sun of mass so that its maximum and minimum distances are
and
respectively. The angular momentum of the planet relative to the centre of the sun is
|
(a) |
(b) |
(c) |
(d) |
