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Current Electricity

Current Electricity
Conductivity is the reciprocal of

Resistivity
Current density
None of the listed here
Resistance

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Current Electricity
The minimum charge on an ion is

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

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Current Electricity
Ohm's law is not applicable to

Small resistors
Semi-conductors
High currents
Dc circuits

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Current Electricity
The resistance of two wires is 25 Ω when connected in series and 6 Ω when joined in parallel. The resistance of each wire is

5 Ω, 10 Ω
20 Ω, 30 Ω
10 Ω, 20 Ω
10 Ω, 15 Ω

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Current Electricity
The hot resistance of the bulb's filament is higher than its cold resistance because the temperature coefficient of the filament is

Negative
Zero
Positive
About 2 ohms per degree

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Current Electricity
The resistance of a copper wire 200 m long is 21 ω. If its thickness (diameter) is 0.44 mm, its specific resistance is around

1.6 x 10-8 ω-m
1.8 x 10-8 ω-m
1.2 x 10-8 ω-m
1.4 x 10-8 ω-m

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