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Current Electricity

Current Electricity
A copper wire has a resistance of 10 Ω. It is stretched by one-tenth of its original length. Then its resistance will be

9 Ω
12.1 Ω
11 Ω
10 Ω

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Current Electricity
Electrical current is due to the flow of

Neutral particles only
Positive charges only
Both positive and negative charges
Negative charges only

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Current Electricity
Insulators have _______ temperature co-efficient of resistance.

None of the listed here
Positive
Negative
Zero

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Current Electricity
The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other?

64 Q
48 Q
18 Q
36 Q

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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

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

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Current Electricity
Electric current passing through the circuit produces

Thermal effect
Chemical effect
Magnetic effect
Luminous effect

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