You want to use the idea of electromagnetic induction to make the bulb in your s

Question

You want to use the idea of electromagnetic induction to make the bulb in your small flashlight glow; it glows when the potential difference across it is 1.5 V. You have a small bar magnet and a coil with 100 turns, each with area 3.1 × 104m2. The magnitude of the B field at the front of the bar magnet's north pole is 3.6×102 T and reaches 0 T when it is about 4.0 cm away from the pole.

A)With what speed should you move the magnet to make the bulb light?

B)Can you make the bulb light?

            -yes

            - no the speed is unreasonable

            -I need more data

Explanation / Answer

the induced emf

A)

E = B * v * l = d pi/dt

B * v * l = dB/dt * A * N

3.6×102 * v * 0.04 = 3.6×102 * 3.1 × 104 * 100

v = 0.775 m/s

B)

induced emf is less than 1.5 V so the bulb will not glow

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