- A10
- B3 × 109
- C4.8 × 10-10
- D0.1
Explanation:
1 emu charge is equal to 10-coulomb charge while 1 coulomb is equal to 3 × 109 esu charge. Emu and C both are the units of charge and hence their conversion formula is necessary for many numerical problems.
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Which is the correct diagram of a half-wave rectifier
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(a) |
(b) |
|
(c) |
(d) |
A proton of mass 1.67
and charge 1.6
is projected with a speed of 2
m/s at an angle of 60° to the X - axis. If a uniform magnetic field of 0.104 Tesla is applied along Y - axis, the path of proton is
|
(a) A circle of radius = 0.2 m and time period |
|
(b) A circle of radius = 0.1 m and time period 2 |
|
(c) A helix of radius = 0.1 m and time period 2 |
|
(d) A helix of radius = 0.2 m and time period 4 |
When radiation of wavelength
is incident on a metallic surface, the stopping potential is 4.8 volts. If the same surface is illuminated with radiation of double the wavelength, then the stopping potential becomes 1.6 volts. Then the threshold wavelength for the surface is
|
(a) 2 |
(b) 4 |
(c) 6 |
(d) 8 |
If and
are the number of electrons and holes in a semiconductor heavily doped with phosphorus, then
|
(a) |
(b) |
(c) |
(d) |