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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
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Topics: Electromagnetic Waves
(28)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A string is stretched between fixed points seperated by 75 cm. It is observed
- The mirrors are inclined at an angle of 50⁰. The number of images formed for an object
- A magnetic needle suspended parallel to a magnetic field requires √3J of work
- A particle moving along a straight line OX.At a time (in second ) the distance
- An avarage induced e.m.f. of 1 V appears in a coil when the current in it is changed
Topics: Electromagnetic Waves (28)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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