- AElectric field only.
- BMagnetic field only.
- CElectromagnetic field.
- DNone of these.
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Two infinitely long parallel wires carry equal current in same direction. The magnetic field at a mid point in between the two wires is
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(a) Twice the magnetic field produced due to each of the wires |
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(b) Half of the magnetic field produced due to each of the wires |
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(c) Square of the magnetic field produced due to each of the wires |
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(d) Zero |
A radio transmitter operates at a frequency of 880 kHz and a power of 10 kW. The number of photons emitted per second are
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(a) 1.72 |
(b) 1327 |
(c) 13.27 |
(d) 0.075 |
A coil having an inductance of 0.5 H carries a current which is uniformly varying from zero to 10 ampere in 2 second. The e.m.f. (in volts) generated in the coil is
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(a) 10 |
(b) 5 |
(c) 2.5 |
(d) 1.25 |
A printed page is seen through a glass slab place on it. The printed words appear raised. This is due to: