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EMF in a current-carrying system.

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A bar is moving across a open-ended loop with resistance R in a presence of a constant perpendicular magnetic field.

a. At what speed should the bar be moved to produce a current of 0.500 A?
b. What is the motional emf?
c. What is the power dissipated by the resistor?
d. What force must be applied to the bar?

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The solution demonstrates step by step how to get from changes in the flux to power dissipation in the circuit. The EMF in a current-carrying system are given.

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• The change in the area of the circuit causes a change in the magnetic flux .
• The change in the flux creates an induced E.M.F in the circuit.
• The induced E.M.F generates a current.
• The direction of the current is such ...

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