CUET · PHYSICS · PYQ PAPER 2025

The electric field and magnetic field of a plane electromagnetic wave propagating in vacuum are expressed as
\(E_x=E_0 \sin (k z-\omega t)\)
\(B_y=B_0 \sin (k z-\omega t)\)
Which of the following statements are correct?
(A). The wave is propagating along the z- direction.
(B). The electric field Ex and magnetic field By are perpendicular to each other and perpendicular to the z direction.
(C) The electric and magnetic fields Ex and By are perpendicular to each other, and parallel to the direction of propagation.
(D) k is related to the wave length À of the wave by the usual equation \(k = A / 2 Tt\)
Choose the correct answer from the options given below:

A (A), (B) and (D) only
B (A) and (B) only
C (A) and (C) only
D (A). (C)and (D) only

Verified Solution

Answer & Solution

Correct Answer

(B) (A) and (B) only

Step-by-step Solution

Detailed explanation

(A) Propagation Direction: The phase of the wave is \((k z-\omega t)\), which indicates the wave is propagating along the positive \(z\)-direction. This statement is correct. (B) Field Orientation: The electric field \(E_x\) is along the \(x\)-axis and the magnetic field \(B_y\)…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match List-I with List-II

List - I	List - II
(A) E is independent of r	(I) For a point charge
(B) \(E \propto \frac{1}{r}\)	(II) For a short dipole
(C) \(E \propto \frac{1}{r^2}\)	(III) For a linear charge distribution
(D) \(E \propto \frac{1}{r^3}\)	(IV) For a surface charge distribution on an infinite plane sheet

Choose the correct answer from the options given below :

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Match List-I with List-II

List-I	List-II
(A) Intrinsic semiconductor	(I) Number of conduction electrons >> number of holes
(B) n-type semiconductor	(II) Number of conduction electrons << number of holes
(C) p-type semiconductor	(III) Net current is zero
(D) p-n junction under equilibrium	(IV) Number of conduction electrons = number of holes

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Match the items of List - I and List - II

List - I (Item)	List - II (Definition/Term)
(A) Instantaneous Rate	(I) rate constant
(B) Average Rate	(II) rate law
(C) Mathematical expression for rate of reaction in terms of concentration of reactants	(III) Short interval of time
(D) Rate of reaction for zero order reaction is equal to	(IV) long direction of time

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