Explanation:
In Image formation from spherical mirrors, only paraxial rays are considered because they form nearly a point Image of a point source. Angle of Incidence of Paraxial rays is very small.
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The process of superimposing signal frequency (i.e. audio wave) on the carrier wave is known as
|
(a) Transmission |
(b) Reception |
(c) Modulation |
(d) Detection |
Electric field at a point varies as 
for
|
(a) An electric dipole |
(b) A point charge |
|
(c) A plane infinite sheet of charge |
(d) A line charge of infinite length |
A parallel combination of two resistors, of 1W each, is connected in series with a 1.5 W resistor. The total combination is connected across a 10 V battery. The current flowing in the circuit is
|
(a) 5 A |
(b) 20 A |
(c) 0.2 A |
(d) 0.4 A |
Two concentric coils each of radius equal to 2π cm are placed at right angles to each other. 3 ampere and 4 ampere are the currents flowing in each coil respectively. The magnetic induction in 
at the centre of the coils will be (
|
(a) 5 |
(b) 7 |
(c) 12 |
(d) |
The pressure exerted by an electromagnetic wave of intensity I (watts/m2) on a nonreflecting surface is [c is the velocity of light]
|
(a) Ic |
(b) |
(c) I/c |
(d) |
A coil has 1,000 turns and 500 cm2 as its area. The plane of the coil is placed at right angles to a magnetic induction field of 2
. The coil is rotated through 180° in 0.2 seconds. The average e.m.f. induced in the coil, in milli-volts, is
|
(a) 5 |
(b) 10 |
(c) 15 |
(d) 20 |
