- ASpherical
- BCylindrical
- CPlanar
- DNone of these
Explanation:
when you considered it a large distance and measuring justice Mall section of it then it can be considered to be plane wavefront source at Infinity example the one coming from sun to earth surface is considered to be plain VU friend from light diverging from a point source will be spherical.
So, the wave front due to a source situated at infinity is planar.
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64 drops each having the capacity C and potential V are combined to form a big drop. If the charge on the small drop is q, then the charge on the big drop will be
|
(a) 2q |
(b) 4q |
(c) 16q |
(d) 64q |
Wavelength of light of frequency 100Hz
|
(a) 2 |
(b) 3 |
(c) 4 |
(d) 5 |
The magnetic field due to the earth is closely equivalent to that due to
|
(a) A large magnet of length equal to the diameter of the earth |
| (b) A magnetic dipole placed at the centre of the earth |
| (c) A large coil carrying current |
| (d) Neither of the above |
The resistance of a wire of uniform diameter d and length L is R. The resistance of another wire of the same material but diameter 2d and length 4L will be
|
(a) 2R |
(b) R |
(c) R/2 |
(d) R/4 |
