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Current Electricity

Current Electricity
An open resistor, when checked with an ohmmeter reads

Low but not zero
High but within tolerance
Zero
Infinite

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

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Current Electricity
Electrical current is due to the flow of

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

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Current Electricity
Varistors are

Non-linear resistors
Carbon resistors
Insulators
Resistor with zero temperature co-efficient

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Current Electricity
An instrument which detects electric current is known as

Wattmeter
Voltmeter
Galvanometer
Rheostat

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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

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

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