- AElectric field due to charge q at that point.
- BPotential energy due to charge q at that point.
- CBoth a and b.
- DNone.
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A small lamp is hung at a height of 8 feet above the centre of a round table of diameter 16 feet. The ratio of intensities of illumination at the centre and at points on the circumference of the table will be
|
(a) 1 : 1 |
(b) 2 : 1 |
(c) 2 |
(d) 3 : 2 |
100 mA current gives a full scale deflection in a galvanometer of 2Ω resistance. The resistance connected with the galvanometer to convert it into a voltmeter to measure 5V is
|
(a) 98 Ω |
(b) 52 Ω |
(c) 50 Ω |
(d) 48 Ω |
When the accelerating voltage applied on the electrons increased beyond a critical value
|
(a) Only the intensity of the various wavelengths is increased |
| (b) Only the wavelength of characteristic relation is affected |
| (c) The spectrum of white radiation is unaffected |
|
(d) The intensities of characteristic lines relative to the white spectrum are increased but there is no change in their wavelength |
If T is the half life of a radioactive material, then the fraction that would remain after a time
is
|
(a) |
(b) |
(c) |
(d) |
The number of electrons to be put on a spherical conductor of radius 0.1m to produce an electric field of 0.036 N/C just above its surface is
|
(a) 2.7 |
(b) 2.6 |
(c) 2.5 |
(d) 2.4 |