# Electrical Engineering - Magnetism and Electromagnetism

### Exercise :: Magnetism and Electromagnetism - General Questions

11.

There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 Wb?

 A. 14,400 At/Wb B. 1,440 At/Wb C. 9,000 At/Wb D. 90,000 At/Wb

Explanation:

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12.

A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?

 A. 90 B. 180 C. 270 D. 360

Explanation:

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13.

What is the flux density in a magnetic field in which the flux in 0.1 m2 is 600 Wb?

 A. 6,000 T B. 600 T C. 600 T D. 6 T

Explanation:

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14.

The unit for permeability is

 A. Wb/At × m B. At/m C. At/Wb D. Wb

Explanation:

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15.

What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?

 A. 18.75 At B. 30 At C. 300 At D. 187 At