Question

In: Physics

1. A 0.294 m radius, 486-turn coil is rotated one-fourth of a revolution in 3.88 ms,...

1. A 0.294 m radius, 486-turn coil is rotated one-fourth of a revolution in 3.88 ms, originally having its plane perpendicular to a uniform magnetic field. Find the magnetic field strength needed to induce an average emf of 13,000 V.

2. An American traveler in a foreign country carries a transformer to convert that country's standard 175 V to 120 V so that she can use some small appliances on her trip. What is the ratio of turns in the primary and secondary coils of her transformer?

Expert Solution

1) By Faraday's and Lenz's Law

Where

Where B=Magnetic Field A=Area is the angle between the normal to the plane of the coil and magnetic field

One fourth of a revolution means changes from 0 to 90.

Where A=cross sectional area of coil

2) Consider Transformer equation

Where V=Voltage N= Number of coils P and S represent Primary and Secondary

genius_generous answered 2 years ago

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