Electricity and Magnetic Fundamentals

171. The force which set ups or tends to set up magnetic flux in a magnetic circuit

1. Dynamic force
2. Electromotive force
3. Potential difference
4. Magnetomotive force

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172. The greater percentage of materials is _________ .

1. diamagnetic
2. paramagnetic
3. ferromagnetic
4. non-magnetic

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173. The hot resistance of an incandescent lamp is about _________ its cold resistance.

1. 1O times
2. 100 times
3. 5 times
4. 50 times

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174. The idea of preventing one component from affecting another through their common electric and magnetic field is referred to as

1. Hall effect
2. Grounding
3. Shielding
4. Limiting

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175. The induced emf in a wire loop that is moved parallel to a uniform magnetic field is

1. Zero
2. Dependent on the area of the loop
3. Dependent on the shape of the loop
4. Dependent on the magnitude of the field

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176. The K shell or the first shell has how many permissible number of orbiting electrons?

1. 1
2. 2
3. 3
4. 4

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177. The lagging effect between flux density of the material and the magnetizing force applied

1. Permeance
2. Eddy current
3. Hysteresis
4. Reluctance

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178. The magnetic energy stored in an inductor is _________ current.

1. Directly proportional to
2. Inversely proportional to
3. Directly proportional to the square of
4. Inversely proportional to the square of

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179. The magnetic field around the conductor is determined by the

1. Size of the conductor
2. Amount of current
3. Current divided by the resistance
4. Resistance divided by the current

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180. The magnetic field inside a solenoid

1. is zero
2. is uniform
3. increases with distance from the axis
4. decreases with distance from the axis

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