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Current Electricity

Current Electricity
All good conductors have high

Reluctance
Resistance
Thermal conductivity
Conductance

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Current Electricity
The insulation on a current carrying conductor is provided

Both of the listed here
None of above factors
To prevent shock
To prevent leakage of current

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Current Electricity
If the number of valence electrons of an atoms is less than 4,the substance is usually

An insulator
A semiconductor
A conductor
None of the listed here

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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

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

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Current Electricity
When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will

Remain constant
None of these
Increase
Decrease

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Current Electricity
In case of liquids, ohm's law is

Fully obeyed
There is no relation between current and p. d
None of the listed here
Partially obeyed

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