Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-3>Q 22

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The energy associated with electric field is $(U_{E})$ and with magnetic field is $(U_{B})$ for an electromagnetic wave in free space. Then:

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Important Questions on Electromagnetic Waves

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Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-3>Q 23

If the magnetic field of a plane electromagnetic wave is given by (The speed of light

= 3 \times 10^{8} m s^{- 1}

)

B = 100 \times 10^{- 6} \sin [2 π \times 2 \times 10^{15} (t - \frac{x}{c})]

then the maximum electric field associated with it is:

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Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-3>Q 24

An electromagnetic wave of intensity

50 W m^{- 2}

enters in a medium of refractive index '

n

' without any loss. The ratio of the magnitudes of electric fields, and the ratio of the magnitudes of magnetic fields of the wave before and after entering into the medium are respectively, given by:

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Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-4>Q 1

The displacement current flows in the dielectric of a capacitor, when the potential difference across its plates

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Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-4>Q 2

A man can take pictures of those objects which are not fully visible to the eye using camera films acceptable to

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Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-4>Q 3

The electromagnetic radiations are in descending order of wavelengths in following sequence

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Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-4>Q 4

Maxwell's equations describe the fundamental laws of,

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Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-4>Q 5

Radio waves diffract around buildings, although light waves do not. The reason is that radio waves

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Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-4>Q 6

Which rays are not the portion of electro-magnetic spectrum?