The magnetic induction at a point P which is distant 4 cm from a long current carrying wire is 
. The field of induction at a distance 12 cm from the same current would be
|
(a) 3.33 |
(b) 1.11 |
(c) 3 |
(d) 9 |
(c) 3 
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An antenna is a device
|
(a) That converts electromagnetic energy into radio frequency signal |
|
(b) That converts radio frequency signal into electromagnetic energy |
|
(c) That converts guided electromagnetic waves into free space electromagnetic waves and vice-versa |
|
(d) None of these |
n immersion heater is rated 836 watt. It should heat 1 litre of water from 10℃ to 40℃ in about
|
(a) 200 sec |
(b) 150 sec |
(c) 836 sec |
(d) 418 sec |
The emf of a battery is 2 V and its internal resistance is 0.5 W. The maximum power which it can deliver to any external circuit will be
|
(a) 8 Watt |
(b) 4 Watt |
(c) 2 Watt |
(d) None of the above |
If the ammeter in the given circuit reads 2 A, the resistance R is
|
(a) 1 ohm |
(b) 2 ohm |
(c) 3 ohm |
(d) 4 ohm |
A moving coil galvanometer has N number of turns in a coil of effective area A, it carries a current I. The magnetic field B is radial. The torque acting on the coil is
|
(a) |
(b) |
(c) |
(d) NABI |
The plates of parallel plate capacitor are charged upto 100 V. A 2mm thick plate is inserted between the plates. Then to maintain the same potential difference, the distance between the plates is increased by 1.6 mm. The dielectric constant of the plate is
|
(a) 5 |
(b) 1.25 |
(c) 4 |
(d) 2.5 |
