- AStatic current
- BConventional current
- CElectronic current
- DPotential current
Explanation:
The carriers of electric current are electrons. The current in a circuit is due to the flow of electrons. Therefore, the direction of the conventional current is opposite to the direction of flow of electrons.
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In the case of forward biasing of PN-junction, which one of the following figures correctly depicts the direction of flow of carriers
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(a)
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(b)
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(c)
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(d)
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If a source of light is moving away from a stationary observer, then the frequency of light wave appears to change because of
|
(a) Doppler's effect |
(b) Interference |
(c) Diffraction |
(d) None of these |
A square of side ‘a’ has charge Q at its centre and charge ‘q’ at one of the corners. The work required to be done in moving the charge ‘q’ from the corner to the diagonally opposite corner is
|
(a) Zero |
(b) |
(c) |
(d) |
A dry cell has an e.m.f. of 1.5 V and an internal resistance of 0.05Ω. The maximum current obtainable from this cell for a very short time interval is
|
(a) 30 A |
(b) 300 A |
(c) 3 A |
(d) 0.3 A |
A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is and the fish is 12 cm below the surface, the radius of this circle in cm is
|
(a) 36 |
(b) 4 |
(c) 36 |
(d) 36/ |
The magnetic potential at a point on the axial line of a bar magnet of dipole moment M is V. What is the magnetic potential due to a bar magnet of dipole moment
at the same point
| (a) 4V | (b) 2V |
(c) |
(d) |