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CURRENT ELECTRICITY

Current Electricity
Resistance of a material always decreases if

Number of free electrons available becomes more
Temperature of material is increased
Temperature of material is decreased
None of these

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Current Electricity
The minimum charge on an ion is

None of these
Equal to the charge of an electron
Equal to the atomic number of the atom
Equal to the charge of the number of electrons in an atom (#) zero

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Current Electricity
Current velocity through a copper conductor is

nearly 3 x 108 m/s
independent of current strength
of the order of a few ^.s/m
the same as propagation velocity of electric energy

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Current Electricity
For which of the following 'ampere second' could be the unit?

Energy
Charge
Power
Reluctance

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Current Electricity
It becomes more difficult to remove

Third electron from the orbit
Second electron from the orbit
Any electron from the orbit
First electron from the orbit

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