- Aelectric current produces magnetism.
- Bmagnets can produce electric current.
- Cmagnets can't produce electric current.
- Da and b
Explanation:
A magnet can generate electric current by the means of electromagnetic induction. When there is a relative motion between a coil and a magnet, the magnetic flux linked to the coil changes due to that relative motion. This change in magnetic flux will induce a current in the coil, which is known as induced current.
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A 5 ℃ rise in the temperature is observed in a conductor by passing some current. When the current is doubled, then rise in temperature will be equal to
|
(a) 5 ℃ |
(b) 10 ℃ |
(c) 20 ℃ |
(d) 40 ℃ |
A prism (μ = 1.5) has the refracting angle of 30°. The deviation of a monochromatic ray incident normally on its one surface will be (sin 48° 36’ = 0.75)
|
(a) 18° 36’ |
(b) 20° 30’ |
(c) 18° |
(d) 22°1’ |
The distance between the two charges 25μC and 36μC is 11 cm At what point on the line joining the two, the intensity will be zero
|
(a) At a distance of 5 cm from 25 μC |
(b) At a distance of 5 cm from 36 μC |
|
(c) At a distance of 10 cm from 25 μC |
(d) At a distance of 11 cm from 36 μC |
When a white light passes through a hollow prism, then
|
(a) There is no dispersion and no deviation |
(b) Dispersion but no deviation |
|
(c) Deviation but no dispersion |
(d) There is dispersion and deviation both |


The threshold wavelength for photoelectric effect of a metal is 6500 Å. The work function of the metal is approximately
|
(a) 2 eV |
(b) 1 eV |
(c) 0.1 eV |
(d) 3 eV |
In the nth orbit, the energy of an electron
for hydrogen atom. The energy required to take the electron from first orbit to second orbit will be
|
(a) 10.2 eV |
(b) 12.1 eV |
(c) 13.6 eV |
(d) 3.4 eV |