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A plane electromagnetic wave of frequency 20 MHz travels through a space along x-direction. If the electric field vector at a certain point in space is 6 Vm⁻¹, then what is the magnetic field vector at that point?
Options
(a) 2×10⁻⁸ T
(b) (1/2) x 10⁻⁸ T
(c) 2 T
(d) (1/2) T
Correct Answer:
2×10⁻⁸ T
Explanation:
The magnetic field, B = E / c, where c = 3 × 10⁸ ms⁻¹
B = 6 / 3 × 10⁸ = 2 × 10⁻⁸ T
Related Questions: - A black body at a temperature of 227⁰C radiates heat at a rate of 20 cal m⁻²s⁻¹.
- An alternating electric field, of frequency v, is applied across the dees (radius = R)
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Topics: Electromagnetic Waves
(28)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A black body at a temperature of 227⁰C radiates heat at a rate of 20 cal m⁻²s⁻¹.
- An alternating electric field, of frequency v, is applied across the dees (radius = R)
- The threshold wavelength for photoelectric effect of a metal is 6500 Å. The work function
- Two identical thin plano-convex glass lenses (refractive index 1.5) each having
- When a mass m is attached to a spring, it normally extends by 0.2 m.
Topics: Electromagnetic Waves (28)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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