A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. A u

Question

A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced emf. Halogen bulbs have some differences from standard incandescent lightbulbs. They are generally smaller, the filament runs at a higher temperature, and they have a quartz (rather than glass) envelope. They may also operate at lower voltages. Consider a 12V, 50W halogen bulb for use in a desk lamp. The lamp plugs into a 120V/60Hz outlet and it has a transformer in its base. The 12V rating of the bulb refers to the rms voltage, what is the peak voltage across the bulb? Suppose the transformer in the base of the lamp has 500 turns of wire on its primary coil. How many turns are on the secondary coil? How much current is drawn by the lamp at the outlet? That is, what is the rms current in the primary? A DC motor of internal resistance 6.0 Ohm is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back emf when the motor is running at full speed? An AC voltage source is described by V = 120sin(377f). This is attached to a 10 Q resistor.

Explanation / Answer

1)

Using Faraday's law for induced emf .. E = (-) n.?(B x A)/t

In this case the change in flux linkage is due to the field change ..
E = n.A.?B/t

E = 200 x (0.18m)

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