Assertion :Heater wire must have high resistance than connecting wires and high melting point. Reason: If resistance is high, the electrical conductivity will be less.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Heater wire must have high resistance than connecting wires and must have a high melting point because the main purpose of heater is to produce heat which in turn is proportional to the resistance (Joule's Law of Heating). So the melting point needs to be high to ensure that the wire doesn't melt with increased temperatures.
And higher resistance mean higher heat production.
Resistance
$R = ρ \frac{L}{A}$
$R = \frac{L}{σ A}$ where $σ = \frac{1}{ρ}$ = conductivity. So high resistance will give less conductivity because $R$ and conductivity are inversely proportional.

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