Explanation:
The current is induced in a closed circuit only if there is a change in number of magnetic field lines in the circuit due to electromagnetic induction according to Faraday's law.
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In the circuit shown in figure, the current drawn from the battery is 4A. If 10 W resistor is replaced by 20 W resistor, then current drawn from the circuit will be
|
(a) 1 A |
(b) 2 A |
(c) 3 A |
(d) 0 A |
A beam with wavelength 
falls on a stack of partially reflecting planes with separation d. The angle q that the beam should make with the planes so that the beams reflected from successive planes may interfere constructively is (where n = 1, 2, ……)
|
(a) |
(b) |
(c) |
(d) |
In a circuit with a coil of resistance 2 ohms, the magnetic flux changes from 2.0 Wb to 10.0 Wb in 0.2 second. The charge that flows in the coil during this time is
|
(a) 5.0 coulomb |
(b) 4.0 coulomb |
(c) 1.0 coulomb |
(d) 0.8 coulomb |
Comparing real and virtual images, we may say that:
A manufacturer uses a concave lens instead of a convex lens in a magnifying glass by mistake. What will be the effect on the working of the lens?
