- AScalar quantity.
- BVector quantity.
- CDimensionless quantity.
- DNone of these options.
Explanation:
Current density is a vector quantity.
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The photoelectric work function for a metal surface is 4.125 eV. The cut-off wavelength for this surface is
|
(a) 4125 Å |
(b) 2062.5 Å |
(c) 3000 Å |
(d) 6000 Å |
A given charge is situated at a certain distance from an electric dipole in the end-on position experiences a force F. If the distance of the charge is doubled, the force acting on the charge will be
|
(a) 2F |
(b) F / 2 |
(c) F / 4 |
(d) F / 8 |
Masses of three wires of copper are in the ratio of 1 : 3 : 5 and their lengths are in the ratio of 5 : 3 : 1. The ratio of their electrical resistances are
|
(a) 1 : 3 : 5 |
(b) 5 : 3 : 1 |
(c) 1 : 15 : 125 |
(d) 125 : 15 : 1 |
At a certain place the angle of dip is 30° and the horizontal component of earth's magnetic field is 0.50 Oersted. The earth's total magnetic field is
|
(a) |
(b) 1 |
(c) |
(d) |