Back to ELECTROMAGNETIC WAVES
JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES
1
Medium
1 of 1
Understanding
+4 | -1
Assertion: A changing electric-field produces a magnetic field.
Reason: A changing magnetic field produces an electric field.
Reason: A changing magnetic field produces an electric field.
View answer and explanation
Correct option: B
Both Assertion and reason are true, but reason is not the correct explanation of Assertion.
Option B is correct because both a changing electric field produces a magnetic field, and a changing magnetic field produces an electric field, but the latter doesn't explain the former.
More Questions from ELECTROMAGNETIC WAVES
Practice All Chapter MCQs →
Statement I: Sound waves are not electromagnetic waves.
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
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