- AA moving charge.
- BA changing electric field.
- CNone of these.
- DBoth of these.
Explanation:
A moving charge and changing electric field both produces magnetic field.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The refractive indices of water and glass with respect to air are 1.2 and 1.5 respectively. The refractive index of glass with respect to water is
|
(a) 0.6 |
(b) 0.8 |
(c) 1.25 |
(d) 1.75 |
What type of modulation is employed in India for radio transmission
|
(a) Amplitude modulation |
(b) Frequency modulation |
|
(c) Pulse modulation |
(d) None of these |
An electric bulb marked 40 W and 200 V, is used in a circuit of supply voltage 100 V. Now its power is
|
(a) 100W |
(b) 40W |
(c) 20W |
(d) 10W |

An inductor, L a resistance R and two identical bulbs,
and
are connected to a battery through a switch S as shown in the figure. The resistance R is the same as that of the coil that makes L. Which of the following statements gives the correct description of the happenings when the switch S is closed

|
(a) The bulb B2 lights up earlier than B1 and finally both the bulbs shine equally bright |
|
(b) B1 light up earlier and finally both the bulbs acquire equal brightness |
|
(c) B2 lights up earlier and finally B1 shines brighter than B2 |
|
(d) B1 and B2 light up together with equal brightness all the time |