- ACoulomb force is a central force.
- BThe force between two charges depend on the medium between them.
- CCoulomb force is a weak force.
- DThe net force on a charge is the vector sum of the forces acting on it due to several other charges.
Explanation:
Coulomb force is a strong force. It can be shown that the Coulomb force between two electrons is 1043 times than gravitational force. All the other options are basic properties of Coulomb’s Law.
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The wavelength of X-rays is
| (a) 2000 Å | (b) 2 Å | (c) 1 mm | (d) 1 cm |
A change of 0.8 mA in the anode current of a triode occurs when the anode potential is changed by 10 V. If m = 8 for the triode, then what change in the grid voltage would be required to produce a change of 4 mA in the anode current
|
(a) 6.25 V |
(b) 0.16 V |
(c) 15.2 V |
(d) None of these |
When neutrons are bombarded on nucleus of
, the number of emitted neutrons will be
|
(a) 1 |
(b) 2 |
(c) 3 |
(d) 4 |
The two waves represented by y1 = a sin(wt) and have a phase difference of
|
(a) 0 |
(b) |
(c) |
(d) |
The graph gives the magnitude B(t) of a uniform magnetic field that exists throughout a conducting loop, perpendicular to the plane of the loop. Rank the five regions of the graph according to the magnitude of the emf induced in the loop, greatest first

|
(a) b > (d = e) < (a = c) |
(b) b > (d = e) > (a = c) |
|
(c) b < d < e < c < a |
(d) b > (a = c) > (d = e) |