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ICSE Class 10 Physics 2020 Paper

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Question : 23 of 67
Marks: +1, -0
When a current carrying conductor is placed in a magnetic field, it experiences a mechanical force. What should be the angle between the magnetic field and the length of the conductor so that the force experienced is :
(i) Zero
(ii) Maximum?
Solution:  
We know, F=BIlsin⁡θ,F = BI l \sin \theta,
where θ\theta is the angle between the magnetic field and the length of the conductor, thus
(i) For the force (F) to be zero, angle θ=0∘\theta = 0^{\circ} (∵sin⁡0∘=0)(\because \sin 0^{\circ}=0)
(ii) For the force (F)(F) to be maximum, angle θ=90∘(∵sin⁡90∘=1)\theta = 90^{\circ} (\because \sin 90^{\circ}=1)
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