Current Electricity
Resistance of a material always decreases if

Temperature of material is increased
Number of free electrons available becomes more
None of these
Temperature of material is decreased

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

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