SATHEE: Magnetics 6 Question 25

Magnetics 6 Question 25

28. A metallic block carrying current $I$ is subjected to a uniform magnetic induction $B$ as shown in figure. The moving charges experience a force $F$ given by …… which results in the lowering of the potential of the face.

Assume the speed of the charges to be $v$ .

$(1996, 2 M)$

Analytical & Descriptive Questions

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Answer:

Correct Answer: 28. $e v B \hat{k}, A B C D$ 29. $ω_{max} = \frac{D T_{0}}{B Q R^{2}}$

Solution:

In metals, charge carries are free electrons. Current is in positive direction of $x$ -axis. Therefore, charge carries will be moving in negative direction of $x$ -axis.

$\begin{aligned} F_{m} = q (v \times B) & = (- e) (- v \hat{i}) \times (B \hat{j}) \\ F_{m} & = e v B \hat{k} \end{aligned}$

Due to this magnetic force, electrons will be collecting at face $A B C D$ , therefore lowering its potential.

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Magnetics 6 Question 25

28. A metallic block carrying current I is subjected to a uniform magnetic induction B as shown in figure. The moving charges experience a force F given by …… which results in the lowering of the potential of the face.

Analytical & Descriptive Questions

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28. A metallic block carrying current $I$ is subjected to a uniform magnetic induction $B$ as shown in figure. The moving charges experience a force $F$ given by …… which results in the lowering of the potential of the face.