- AMagnetic Current
- BElectrostatic Current
- CInduced Current
- DNone
Explanation:
Electric current produced by a moving straight wire in a magnetic field is Induced Current The current due to the emf induced due the change in magnetic flux of a coil when a magnet is inserted in it is induced current.When in a coil there is change in magnetic flux an emf is generated such that it opposes the change in magnetic flux. The current generated due to this emf is known as induced current.
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Magnetic fields at two points on the axis of a circular coil at a distance of 0.05m and 0.2m from the centre are in the ratio 8 : 1. The radius of the coil is
|
(a) 1.0 m |
(b) 0.1 m |
(c) 0.15 m |
(d) 0.2 m |
The conductivity of a superconductor is
|
(a) Infinite |
(b) Very large |
(c) Very small |
(d) Zero |

The minimum energy required to excite a hydrogen atom from its ground state is
|
(a) 13.6 eV |
(b) -13.6 eV |
(c) 3.4 eV |
(d) 10.2 eV |
The dominant mechanisms for motion of charge carriers in forward and reverse biased silicon P-N junctions are
|
(a) Drift in forward bias, diffusion in reverse bias |
|
(b) Diffusion in forward bias, drift in reverse bias |
|
(c) Diffusion in both forward and reverse bias |
|
(d) Drift in both forward and reverse bias |
In determining the temperature of a distant star, one makes use of
|
(a) Kirchhoff's law |
(b) Stefan's law |
|
(c) Wien's displacement law |
(d) None of these |
The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately
|
(a) 540 nm |
(b) 400 nm |
(c) 310 nm |
(d) 220 nm |
A parallel plate capacitor is made by stacking n equally spaced plates connected alternately. If the capacitance between any two plates is C then the resultant capacitance is
|
(a) C |
(b) nC |
(c) (n – 1)C |
(d) (n + 1)C |