Why does a current-carrying conductor experience no mechanical force when it is…

MATHEMATICS · Single correct · ISC · Mathematics · Physics · Magnetic Effects of Current and Magnetism

Problem

Why does a current-carrying conductor experience no mechanical force when it is placed parallel to a uniform magnetic field? (a) Because the magnetic field strength effectively becomes zero when the conductor is aligned with it, so no force acts (b) Because cos⁡0∘=0\cos 0^{\circ}=0 in the expression F=BILcos⁡θF = B I L \cos\theta, making the force zero (c) Because the angle between the current and the magnetic field is 0∘0^{\circ}, so sin⁡0∘=0\sin 0^{\circ}=0 and the force F=BILsin⁡θF = B I L \sin\theta vanishes (d) Because the magnetic field cancels the current in the conductor when they are parallel, leaving no current to experience force

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