AP EAMCET · PHYSICS · Magnetic Effects of Current
Torques \(\tau_1\) and \(\tau_2\) are required for a magnetic needle to remain perpendicular to the magnetic fields of \(B_1\) and \(B_2\) at two different places. The ratio of \(B_1: B_2\) is equal to
- A \(\tau_2: \tau_1\)
- B \(\tau_1: \tau_2\)
- C \(\frac{\tau_1+\tau_2}{\tau_1-\tau_2}\)
- D \(\frac{\tau_1-\tau_2}{\tau_1+\tau_2}\)
Answer & Solution
Correct Answer
(B) \(\tau_1: \tau_2\)
Step-by-step Solution
Detailed explanation
Given that torques \(\tau_1\) and \(\tau_2\) are required for a magnetic needle to remain perpendicular to the magnetic field \(B_1\) and \(B_2\). We know that, torque acting on a magnet in uniform magnetic field. \[ \therefore \quad \tau=M B \sin \theta \] where,…
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