Question

1. A loop of wire passes through a constant magnetic field going out of the page. As the loop begins to enter the magnetic field what direction will the current be induced?

Counter clockwise

Into the page

Out of the page

In a zig zag around the earth

Clockwise

2. Faraday’s low of induction states that the emf induced in a loop of wire is proportional to

(magnetic flux)/(time)

(time)/(magnetic flux)

(magnetic flux)(magnetic field)

(current)/(time)

(magnetic flux)(area)

3. The number of turns in a transformer is inversely proportional to

Voltage

Current

Number of coils

4. In an induced emf, the current creates a magnetic field that ______ the magnetic field

amplifies the change of

is perpendicular to

opposes the change of

loops around

moves towards

5. Two parallel wires carry the same current in the same direction. What is the magnetic force between the two wires?

The wires attract each other

The wires repel each other

They are pulled in the direction of the current

The wires feel a counter clockwise torque

6. The number of coils in the primary coil of a transformer is fewer than the number of coils in the secondary coil. This would result in a

Step down transformer

220V transformer

Step up transformer

DC transformer

7. A coil of 25 turns with a diameter of 15cm rests in a magnetic field of 0.10T.

A. What is the max flux through the coil if the magnetic field is perpendicular to the plan of the coil (normal is parallel to B field)

B. The coil is rotated so the normal is perpendicular to the magnetic field in 15ms, what is the average induced emf?

Answer 1

1) Clockwise by Faraday law

2) Change in magnetic flux / time

3) according to ratio of current in transformer the no. Of turns is inverse of voltage accros the coil

5) Wires attract each other

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