CUET · PHYSICS · PYQ PAPER 2023

Which of the following is the correct expression for force due to a magnetic field (\( \vec{B} \)) on a straight conductor of length (\( l \)) carrying current \( I \)?

A \( \vec{F} = I(\vec{B} \times \vec{l}) \)
B \( \vec{F} = \vec{B}(I \times \vec{l}) \)
C \( \vec{F} = I(\vec{l} \times \vec{B}) \)
D \( \vec{F} = I(\vec{l} \times \vec{B}) \)

Verified Solution

Answer & Solution

Correct Answer

(C) \( \vec{F} = I(\vec{l} \times \vec{B}) \)

Step-by-step Solution

Detailed explanation

The magnetic force is defined as the cross product of the length vector and the magnetic field vector, expressed as \(F=I(l \times B)\). The direction of the force is perpendicular to both the current and the magnetic field, as determined by the right-hand rule. C)…

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.

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Choose the correct answer from the options given below:

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