Explanation:
The angle between magnetic field and area vector is 90°, so the flux associated with coil is zero. Although magnetic field is changing but flux is remaining constant equal to zero, so emf induced and hence current in the loop is equal to zero.
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The diagram shows-the energy levels for an electron in a certain atom. Which transition shown represents the emission of a photon with the most energy
| (a) I | (b) II | (c) III | (d) IV |
In a conductor 4 coulombs of charge flows for 2 seconds. The value of electric current will be
|
(a) 4 volts |
(b) 4 amperes |
(c) 2 amperes |
(d) 2 volts |
4 eV is the energy of the incident photon and the work function in 2eV. What is the stopping potential
|
(a) 2V |
(b) 4V |
(c) 6V |
(d) 2 |
The number of turns in the coil of an ac generator is 5000 and the area of the coil is 
. The coil is rotated at the rate of 100 cycles/sec in a magnetic field of 0.2
. The peak value of the emf generated is nearly
|
(a) 786 kV |
(b) 440 kV |
(c) 220 kV |
(d) 157.1 kV |
In the above question, the resistance between the square faces is
|
(a) 3 |
(b) 3 |
(c) 3 |
(d) 3 |
In a hydrogen atom, an electron moves in a circular orbit of radius 5.2 
and produces a magnetic induction of 12.56 T at its nucleus. The current produced by the motion of the electron will be (Given 
|
(a) 6.53 |
(b) 13.25 |
|
(c) 9.6 |
(d) 1.04 |
