Electronics - Magnetism and Electromagnetism

Exercise :: Magnetism and Electromagnetism - Filling the Blanks

1. 


When the current through a coil reverses direction, the magnetic field around the coil _____.

A. does not change
B. disappears
C. increases in strength
D. reverses direction

Answer: Option D

Explanation:

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2. 

The flux density is ___ when the magnetic flux is 9 µWb and the cross-sectional area of the magnetic field is 5 × 10–3 m2.

A. 1800 µT
B. 555.56 T
C. 9 µT
D. 5 × 10–3 T

Answer: Option A

Explanation:

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3. 

After the magnetizing force has been removed, the ratio of the remaining magnetic flux to the saturated magnetic flux is called _____________.

A. saturation
B. retentivity
C. hysteresis
D. coercivity

Answer: Option B

Explanation:

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4. 

You can determine the direction of the lines of force surrounding a conductor by using _____.

A. the right-hand rule
B. the left-hand rule
C. Lenz's law
D. Faraday's law

Answer: Option A

Explanation:

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5. 

A group of force lines going from the north pole to the south pole of a magnet is called the magnetic ___.

A. retentivity
B. reluctance
C. hysteresis
D. flux

Answer: Option D

Explanation:

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