PQ is an infinite current carrying conductor.ABandCDare smooth conducting rods on which a conductorEF moves with constant velocityVas shown. The force needed to maintain constant speed ofEF is :a)b)c)d)Correct answer is option 'B'. Can you explain this answer?

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PQ is an infinite current carrying conductor. AB and CD are smooth conducting rods on which a conductor EF moves with constant velocity V as shown. The force needed to maintain constant speed of EF is :

Correct answer is option 'B'. Can you explain this answer?

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Electromagnetic Induction MCQ Level - 2

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PQ is an infinite current carrying conductor.ABandCDare smooth conduct...

Also, power = F.V.

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PQ is an infinite current carrying conductor.ABandCDare smooth conduct...

Also, power = F.V.

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The magnetic flux density \( B \) at a distance \( d \) from a long straight current-carrying conductor is given by:\[B = \frac{\mu_0 I}{2 \pi d}\]where:- \( \mu_0 \) is the permeability of free space,- \( I \) is the current in the conductor,- \( d \) is the distance from the conductor.If the distance is halved to \( \frac{d}{2} \), the new magnetic flux density \( B' \) becomes:\[B' = \frac{\mu_0 I}{2 \pi \left(\frac{d}{2}\right)} = \frac{\mu_0 I}{\pi d} = 2 \times \frac{\mu_0 I}{2 \pi d} = 2B\]Thus, the value of \( a \) is \( \boxed{2} \).?

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PQ is an infinite current carrying conductor.ABandCDare smooth conducting rods on which a conductorEF moves with constant velocityVas shown. The force needed to maintain constant speed ofEF is :a)b)c)d)Correct answer is option 'B'. Can you explain this answer?

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