- End-on position.
- Broadside-on position.
- Both.
- None.
Explanation:

Points lying on the axis of a magnet are called end-on points. In our case, the point on the axis of the loop (on replacing the circular loop with an equivalent magnetic dipole) lies on the axis of the magnetic dipole or on the end-on position.
If P was the point on the axis of the loop, then it is clear from the figure that P lies on the end-on position of the equivalent magnetic dipole.
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A charged particle of mass 0.003 gm is held stationary in space by placing it in a downward direction of electric field of 6 . Then the magnitude of the charge is
|
(a) 5 |
(b) 5 |
(c) -18 |
(d) -5 |
A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is B. It is then bent into a circular loop of n turns. The magnetic field at the centre of the coil will be
|
(a) nB |
(b) n2B |
(c) 2nB |
(d) 2n2B |
The part of a transistor which is heavily doped to produce a large number of majority carriers, is
|
(a) Base |
(b) Emitter |
(c) Collector |
(d) None of these |
The true statement is
|
(a) The order of colours in the primary and the secondary rainbows is the same |
|
(b) The intensity of colours in the primary and the secondary rainbows is the same |
|
(c) The intensity of light in the primary rainbow is greater and the order of colours is the same than the secondary rainbow |
|
(d) The intensity of light for different colours in primary rainbow is greater and the order of colours is reverse than the secondary rainbow |
A radioactive sample of U238 decay to Pb through a process for which half life is 4.5 × 109 years. The ratio of number of nuclei of Pb to U238 after a time of 1.5 × 109 years (given 21/3 = 1.26)
|
(a) 0.12 |
(b) 0.26 |
(c) 1.2 |
(d) 0.37 |