- AA magnet
- BAn unmagnetised iron bar
- CA moving charge
- DStationary charge
Explanation:
Moving charge can develop magnetic field and also experience the magnetic field.
But stationary charge do no have the ability to develop or experience magnetic field from the other magnetic fields.
Because moving charge gives rise to current which is responsible for the magnetic effects.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
AM is used for broadcasting because
|
(a) It is more noise immune than other modulation systems |
|
(b) It requires less transmitting power compared with other systems |
|
(c) Its use avoids receiver complexity |
|
(d) No other modulation system can provide the necessary bandwidth faithful transmission |
If a unit positive charge is taken from one point to another over an equipotential surface, then
|
(a) Work is done on the charge |
(b) Work is done by the charge |
|
(c) Work done is constant |
(d) No work is done |
An electron moving with a speed u along the positive x-axis at y = 0 enters a region of uniform magnetic field which exists to the right of y-axis. The electron exits from the region after some time with the speed v at co-ordinate y, then
|
(a) v > u, y < 0 |
(b) v = u, y > 0 |
(c) v > u, y > 0 |
(d) v = u, y < 0 |
The imaginary line passing through the pole and the center of curvature of the curved mirror is called its _______.
$\frac{1}{2}\text{mgR}$
$2\text{mgR}$
$\text{mgR}$
$\frac{1}{4}\text{mgR}$