- Aelectric current produces magnetism.
- Bmagnets can produce electric current.
- Cmagnets can't produce electric current.
- Da and b
Explanation:
A magnet can generate electric current by the means of electromagnetic induction. When there is a relative motion between a coil and a magnet, the magnetic flux linked to the coil changes due to that relative motion. This change in magnetic flux will induce a current in the coil, which is known as induced current.
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An element A decays into element C by a two step process :
A → B +
B → C +
Then
|
(a) A and C are isotopes |
(b) A and C are isobars |
|
(c) A and B are isotopes |
(d) A and B are isobars |
The radius of the orbital of electron in the hydrogen atom 0.5 Å. The speed of the electron is 2
. Then the current in the loop due to the motion of the electron is
|
(a) 1 mA |
(b) 1.5 mA |
(c) 2.5 mA |
(d) 1.5 |
The potential gradient along the length of a uniform wire is 10 volt/metre. B and C are the two points at 30 cm and 60 cm point on a meter scale fitted along the wire. The potential difference between B and C will be
|
(a) 3 volt |
(b) 0.4 volt |
(c) 7 volt |
(d) 4 volt |
To draw maximum current from a combination of cells, how should the cells be grouped
|
(a) Series |
|
(b)Parallel |
|
(c) Mixed |
|
(d) Depends upon the relative values of external and internal resistance |
An X-ray has a wavelength of 0.010 Å. Its momentum is
| (a) 2.126 × 10–23 kg-m/sec | (b) 6.626 × 10-22 kg-m/sec |
| (c) 3.456 × 20–25 kg-m/sec | (d) 3.313 × 10–22 kg-m/sec |