- AThere will be no induced emf in the coil.
- BThere will be an induced emf in the coil.
- CAn emfwill be induced in the magnet.
- DNone ofthese.
Explanation:
Since the coil and the magnet are moving with same velocity, so there will be no change in magnetic flux linked with the coil due to magnet. Hence no emf is induced in the coil.
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At a distance of 10 cm from a long straight wire carrying current, the magnetic field is 0.04 T. At the distance of 40 cm, the magnetic field will be
|
(a) 0.01 T |
(b) 0.02 T |
(c) 0.08 T |
(d) 0.16 T |
With the increase in principle quantum number, the energy difference between the two successive energy levels
|
(a) Increases |
|
(b) Decreases |
|
(c) Remains constant |
|
(d) Sometimes increases and sometimes decreases |
Unpolarized light of intensity 32Wm–2 passes through three polarizers such that transmission axes of the first and second polarizer makes and angle 30° with each other and the transmission axis of the last polarizer is crossed with that of the first. The intensity of final emerging light will be
|
(a) 32 Wm–2 |
(b) 3 Wm–2 |
(c) 8 Wm–2 |
(d) 4 Wm–2 |
A proton of energy 200 MeV enters the magnetic field of 5 T. If direction of field is from south to north and motion is upward, the force acting on it will be
|
(a) Zero |
(b) 1.6 |
(c) 3.2 |
(d) 1.6 |
125 identical drops each charged to the same potential of 50 volts are combined to form a single drop. The potential of the new drop will be
|
(a) 50 V |
(b) 250 V |
(c) 500 V |
(d) 1250 V |