NEET Physics Question - Electromagnetic Waves

Assertion (A): In an electromagnetic wave, magnitude of magnetic field vector is much smaller than the magnitude of electric field vector.

Reason (R): Energy of electromagnetic waves is shared equally by the electric and magnetic fields.

Both (A) &(R) are true and the (R) is the correct explanation of the (A)

Both (A) &(R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Solution:

In an EM wave, \(E_0 = cB_0\). Since \(c = 3 times 10^8 text{ m/s}\), \(E_0\) is much larger than \(B_0\) in SI units, so A is true. Energy is equally shared between fields, so R is true. However, R does not explain why \(E_0\) is numerically larger than \(B_0\).

Rankers Physics

EM Wave Field Magnitudes

Solution:

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