AP EAMCET · PHYSICS · Magnetic Effects of Current
A bar magnet placed in a uniform magnetic field making an angle \(\theta\) with the field experiences a torque. If the angle made by the magnet with the field is doubled, the torque experienced by the magnet increases by \(41.4 \%\). The initial angle made by the magnet with the magnetic field is
- A \(60^{\circ}\)
- B \(30^{\circ}\)
- C \(90^{\circ}\)
- D \(45^{\circ}\)
Answer & Solution
Correct Answer
(D) \(45^{\circ}\)
Step-by-step Solution
Detailed explanation
As we know, torque in a magnetic field, \( \begin{aligned} \tau & =M B \sin \theta \\ \theta & =\theta_l, \end{aligned} \) then \(\quad \tau_1=M B \sin \theta_1\) ...(i) Similarly, if \(\theta=\theta_2\) then…
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