SATHEE: PYQ NEET- Moving Charges And Magnetism L-1

Question: A wire carrying a current $I$ along the positive $x$ -axis has length $L$ . It is kept in a magnetic field $\vec{B} = (2 \hat{i} + 3 \hat{j} - 4 \hat{k}) T$ . The magnitude of the magnetic force acting on the wire is :

A) $\sqrt{5} IL$

B) 5 IL

C) $\sqrt{3} IL$

D) $3 IL$

Answer: (B) 5 IL

Sol:

$\begin{aligned} \vec{F} = I (\vec{ℓ} \times \vec{B}) & = I [(L \hat{i}) \times (2 \hat{i} + 3 \hat{j} - 4 \hat{k})] & = I (4 L \hat{j} + 3 L \hat{k}) & | \vec{F} | = 5 IL \end{aligned}$

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Question: A wire carrying a current I along the positive x-axis has length L. It is kept in a magnetic field B→=(2i^+3j^−4k^)T. The magnitude of the magnetic force acting on the wire is :

Answer: (B) 5 IL

Sol:

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Question: A wire carrying a current $I$ along the positive $x$ -axis has length $L$ . It is kept in a magnetic field $\vec{B} = (2 \hat{i} + 3 \hat{j} - 4 \hat{k}) T$ . The magnitude of the magnetic force acting on the wire is :