CUET · PHYSICS · PYQ PAPER 2023

A current element \(\Delta \vec{l}=\Delta x \hat{i}\) (where \(\Delta x=1 cm\) ) is placed at the origin and carries a current 10 A . The magnetic field on y -axis at a distance of 0.5 m is :

A \(4 \times 10^{-10} T\)
B \(4 \times 10^{-9} T\)
C \(4 \times 10^{-8} T\)
D \(4 \times 10^{-7} T\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(4 \times 10^{-8} T\)

Step-by-step Solution

Detailed explanation

\(B = \frac{\mu_0}{4\pi} \frac{I \Delta x}{r^2}\) \(B = 10^{-7} \frac{(10)(0.01)}{(0.5)^2} = 4 \times 10^{-8} T\)

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

The equivalent resistance of the network shown in figure between the points a and b will be

CUET 2025 Easy

Match List I with List - II.

List I	List II
(A) Zener diode	(I) operates under forward bias
(B) LED	(II) operates under reverse bias
(C) Solar cell	(III) operates under reverse bias in break down region
(D) Photo diode	(IV) no biasing is applied

Choose the correct answer from the options given below :

CUET 2023 Medium

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