Current Electricity
A thermistor has

Variable temperature coefficient
Zero temperature coefficient
Positive temperature coefficient
Negative temperature coefficient

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Current Electricity
In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains

Length of heating element should be increased
None of these
Length of heating element should be decreased
Length of heating element has no effect on heating if water

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