Magnetic Light Switch Ranking Task Six identical vertical metal bars start at th

Question

Magnetic Light Switch Ranking Task Six identical vertical metal bars start at the positions shown below and move at constant velocities through identical magnetic fields. The bars make electrical contact with and move along frictionless metal rods attached to light bulbs. Part A At the instant shown, rank these six scenarios on the basis of the magnitude of the current in the light bulb. Rank from largest to smallest. To rank items as equivalent, overlap them. Hints Reset Help 20 cm/s 0 cm/s 10 cm/s 10 cm/s 10 cm/s 5 cm/s largest smallest The correct ranking cannot be determined. Submit My Answers Give Up

Explanation / Answer

Emf induced in the circuit E = d(phi)/dt i.e the rate of change of flux. Change of flux equals the product of magnetic filed intensity and the change of area . Change of area equals the product of spacing between the wires and the velocity.So the direction of velocity or the initial area doesnot matter. So the decreasing order of currents in bulbs is

1 > 3 = 4 = 5 > 6 > 2.

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