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JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES
1
Medium
1 of 1
Understanding
+4 | -1
A charged particle can continue to move with a constant velocity in a region wherein,
A.
B.
C.
D.
Select correct alternative:
A.
B.
C.
D.
Select correct alternative:
View answer and explanation
Correct option: C
Only A, C, D
Option C (Only A, C, D) is correct because a charged particle can move with constant velocity when there is no net force, which occurs when E=0, B� 0 (forces cancel), E� 0, B� 0 (forces cancel), or E=0, B=0.
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Statement II: Sound waves require a material medium for propagation. For a plane electromagnetic wave propagating in x-direction, which one of the following combination gives the correct possible directions for electric field and magnetic field respectively? Assertion: The relative velocity of two photons travelling in opposite directions is the velocity of light.
Reason: The rest mass of photon is zero Intensity of electromagnetic wave will be The rms value of the electric field of the light coming from the Sun is . The average total energy density of the electromagnetic wave is Methane is a greenhouse gas because
