The electric field associated with an electromagnetic wave in vacuum is given by E= 40coswhere E, z, and t are in volt/m, meter, and second respectively. The value of wave vector k is:
1. 2.
3. 4. 3
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A lamp radiates power uniformly in all directions, the amplitude of electric field strength at a distance r from it is:
(1) (2)
(3) (4)
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Which of the following statements is false regarding the properties of electromagnetic waves?
1. | Both electric and magnetic field vectors attain the maxima and minima at the same place and the same time |
2. | The energy in an electromagnetic wave is divided equally between electric and magnetic vectors |
3. | Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of the wave |
4. | These waves do not require any material medium for propagation |
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An electromagnetic wave is propagating along Y-axis. Then:
(1) The oscillating electric field is along X-axis and the oscillating magnetic field is along Y-axis.
(2) The oscillating electric field is along Z-axis and the oscillating magnetic field is along X-axis.
(3) Both oscillating electric and magnetic fields are along Y-axis, but the phase difference between them is
(4) Both oscillating electric and magnetic fields are mutually perpendicular in arbitrary directions.
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In a plane E.M. wave, the electric field oscillates sinusoidally at a frequency of 2.5 Hz and amplitude 480 V/m. The amplitude of the oscillating magnetic field will be:
(1)
(2)
(3)
(4)
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The charge of a parallel plate capacitor is varying as . Then find the magnitude of displacement current through the capacitor. (Plate Area = A, separation of plates = d)
(1) (2)
(3) (4)
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The most penetrating radiation out of the following is:
1. \(X\text-\)rays
2. \(\beta\text-\)rays
3. \(\alpha\text-\)rays
4. \(\gamma\text-\)rays
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The direction of propagation of the electromagnetic wave is the same as that of (Here =electric field vector and =magnetic field vector):
(1)
(2)
(3)
(4)
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The rate of change of the voltage of a parallel plate capacitor if the instantaneous displacement current of 1 A is established between the two plates of a 1 F parallel plate capacitor:
(1) (2) 10 V/s
(3) (4)
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The energy density of the electromagnetic wave in vacuum is given by the relation
(1) (2)
(3) (4)
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