Question

brutus builds the simple electric generator pictured below. an electric current is generated in the wire loop whenever he turns the crank, causing the magnet to spin. how could brutus increase the amount of electric current his generator produces? a. replace the wire loop with an unlooped strand of wire b. increase the rate at which he turns the crank c. replace the magnet with a weaker magnet d. increase the distance between the magnet and the wire loop

Explanation:

In a generator, electric current is produced via electromagnetic induction (changing magnetic flux through a conductor).

• Option A: An unlooped wire has less area for flux change, reducing current (looping increases the effective area for induction).
• Option B: Increasing crank - turning rate increases the speed of magnet rotation, which increases the rate of change of magnetic flux through the wire loop. By Faraday's law of electromagnetic induction, a greater rate of flux change induces a larger electromotive force (emf), thus increasing the current.
• Option C: A weaker magnet has a weaker magnetic field, so the flux change (and thus induced emf/current) would decrease.
• Option D: Increasing the distance between the magnet and the wire loop weakens the magnetic field experienced by the loop, reducing the flux change and the induced current.

Answer:

B. increase the rate at which he turns the crank