Electrical And Electronics Test Preparations On Magnetism and Electromagnetism Part 2

Test Preparation on Electrical And Electronics Test Preparations On Magnetism and Electromagnetism Part 2

1.

When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage

1increases
2decreases
3remains constant
4reaches zero

2.

The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is

11,000 V
22,000 V
331.25 V
43,125 V

3.

For a given wirewound core, an increase in current through the coil

1reverses the flux lines
2decreases the flux density
3increases the flux density
4causes no change in flux density

4.

If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density

1increases
2decreases
3remains the same
4doubles

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