Electrical Engineering - Magnetism and Electromagnetism

Exercise :: Magnetism and Electromagnetism - General Questions

16. 

The direction of a magnetic field within a magnet is

A. from south to north
B. from north to south
C. back to front
D. front to back

Answer: Option A

Explanation:

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17. 

When the north poles of two bar magnets are brought close together, there will be

A. no force
B. a downward force
C. a force of attraction
D. a force of repulsion

Answer: Option D

Explanation:

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18. 

The ability of a material to remain magnetized after removal of the magnetizing force is known as

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

Answer: Option D

Explanation:

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19. 

The voltage induced across a certain coil is 200 mV. A 120 resistor is connected to the coil terminals. The induced current is

A. 1.7 mA
B. 16 mA
C. 12 mA
D. 120 mA

Answer: Option A

Explanation:

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20. 

The induced voltage across a stationary conductor in a stationary magnetic field is

A. zero
B. reversed in polarity
C. increased
D. decreased

Answer: Option A

Explanation:

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