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# Electrical Engineering - Magnetism and Electromagnetism

### Exercise

"Weakness of attitude becomes weakness of character."
- Albert Einstein
1.

What is the reluctance of the circuit in problem 9 if the flux is 275 Wb?

 A. 0.0066 At/Wb B. 0.066 At/Wb C. 8,727 At/Wb D. 872 At/Wb

2.

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

 A. increases B. decreases C. remains constant D. reaches zero

3.

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

 A. 1,000 V B. 2,000 V C. 31.25 V D. 3,125 V

4.

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

 A. reverses the flux lines B. decreases the flux density C. increases the flux density D. causes no change in flux density

5.

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

 A. increases B. decreases C. remains the same D. doubles