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A 5 \(\mu\) positively charged particle is moving at 45º to the direction of magnetic...

Physics
JAMB 2025

A 5 \(\mu\) positively charged particle is moving at 45º to the direction of magnetic field with 3 x 10\(^4\)m/s speed. If it experiences a force of 6N, what is the value of the flux density of the field?

  • A. 107.23T
  • B. 75.76T
  • C. 98.44T
  • D. 56.57T
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Correct Answer: Option D
Explanation

\(B = \frac{F}{q \cdot v \cdot \sin \theta}\)

\(\theta = 45^\circ \implies \sin 45^\circ = \frac{\sqrt{2}}{2}\)

Substituting the values:

\(B = \frac{6}{(5 \times 10^{-6})(3 \times 10^4) \left(\frac{\sqrt{2}}{2}\right)}\)

Simplifying:

\(B = \frac{6}{(15 \times 10^{-2}) \left(\frac{\sqrt{2}}{2}\right)} \approx \frac{6}{0.1061} \approx 56.5 \, \text{T}\)

There is an explanation video available below.


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Explanation Video

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