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 3.3×104m^2. The magnitude of the B-field at the front of the bar magnet's north pole is 5.0×10^2 T and reaches 0 T when it is about 4.0 cm away from the pole.

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

Part B Can you make the bulb light?
   a) yes b) no, this speed is unreasonable c) I need more data

Explanation / Answer

Here,

potential , V = 1.5 V

turns , N = 100

area , A = 3.3 *10^-4 m^2

magnetic field , B = 5 *10^-2 T

distance ,d = 4 cm

a)

let the speed is v

V = N * A * B * v

1.5 = 3.3 *10^-4 * 5 *10^-2 * 100 * v

solving for v

v = 909.1 m/s

the speed of magnet needed is 909.1 m/s

b)

Yes , we can make the light bulb glow

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