Electricity and Magnetic Fundamentals

151. The electric flux density is a _________ quantity.

1. phasor
2. vector
3. scalar
4. variable

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152. The electric potential across part AB of a circuit is 5 V; point A being at higher potential. If a charge of 5 C moves from A to B, then energy released as

1. 5 joules
2. 25 joules
3. 10 joules
4. 100 joules

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153. The electric potential at a point in air due to a charge is 21 V. If the air is replaced by a medium of relative permittivity of 3, then electric potential at that point will be

1. 63 V
2. 21 V
3. 7 V
4. 42 V

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154. The electrons in the last orbit of an atom are called _________ electrons.

1. free
2. valence
3. bound
4. thermionic

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155. The emf induced in a coil due to the change of its own flux linked with it is called

1. Mutually induced emf
2. Dynamically induced emf
3. Statically induced emf
4. Self induced emf

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156. The emf induced in a coil due to the changing current of another neighboring coil is called

1. Mutually induced emf
2. Self induced emf
3. Statically induced emf
4. Dynamically induced emf

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157. The emf produced in a wire by its motion across a magnetic field does not depend upon the

1. Diameter of the wire
2. Length of the wire
3. Orientation of the wire
4. Flux density of the field

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158. The emission of electrons from hot bodies is called

1. Radiation effect
2. Edison effect
3. Skin effect
4. Half effect

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159. The energy stored in an electrostatic field or electromagnetic field is called

1. Electromagnetic energy
2. Kinetic energy
3. Potential energy
4. Rest energy

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160. The evaporation of electrons from a heated surface is called

1. Radiation
2. Convection
3. Thermionic emission
4. Conduction

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