1. A 1000-turn coil of wire that is 2.4cm in diameter is in a magnetic field tha

Question

1. A 1000-turn coil of wire that is 2.4cm in diameter is in a magnetic field that drops from 0.15T to 0 T in 12ms . The axis of the coil is parallel to the field.

-What is the emf of the coil?

2. (Figure 1) shows a 15-cm-diameter loop in three different magnetic fields. The loop's resistance is 0.90? .

-For case (a), what is the induced emf?

-For case (a), what is the induced current?

3. A radio antenna broadcasts a 1.0 MHz radio wave with 29kW of power. Assume that the radiation is emitted uniformly in all directions.

-What is the electric field amplitude at this distance?

4. Early black-and-white television sets used an electron beam to draw a picture on the screen. The electrons in the beam were accelerated by a voltage of 3.0 kV; the beam was then steered to different points on the screen by coils of wire that produced a magnetic field of up to 0.49T .

-What is the speed of electrons in the beam?
-What acceleration do they experience due to the magnetic field, assuming that it is perpendicular to their path? What is this acceleration in units of g?
-If the electrons were to complete a full circular orbit, what would be the radius?

5.

Explanation / Answer

1.

Note that

emf = N A(Bf - Bi)/t

As

A = pi r^2 = 4.5239E-4 m^2

Thus,

emf = 5.65 V   [ANSWER]

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