Neco Model Questions Vol1 2017 Physics Question 24
Practice objective / multiple choice question 24 from the 2017 Neco Model Questions Vol1 Physics examination.
A long solenoid of length \(0.50\,\text{m}\) has \(800\) turns and carries a current \(I\). The magnetic field inside the solenoid is given by \(B=\mu_0 n I\) where \(n=N/L\) and \(\mu_0=4\pi\times10^{-7}\,\text{T·m·A}^{-1}\). A small bar magnet with magnetic dipole moment \(m=0.020\,\text{A·m}^2\) is placed at the centre of the solenoid, making an angle of \(30^{\circ}\) with the field direction. (i) Find the magnitude of the torque on the magnet when the solenoid current is \(2.0\,\text{A}\). (ii) If the current is increased at a constant rate of \(0.50\,\text{A s}^{-1}\), determine the magnitude of the emf induced in a single circular loop of radius \(0.040\,\text{m}\) that is coaxial with the solenoid.
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This is Neco Model Questions Vol1 2017 Physics Question 24. It is one of the objective questions from the 2017 Neco Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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