A heater coil is cut into two equal parts and only one part is used in

1.	A heater coil is cut into two equal parts and only one part is used in the heater the heat generated now will be 1. doubled 2. four times 3. one fourth 4. halved
Answer» 1. doubled Resistance of the heater be R. New resistance of heater is R/2. Initial power = v² / R Final power = \(\cfrac{v^2}{\frac{R}{2}}=2\frac{v^2}{R}\) ∴ Heat generated is doubled.

A heater coil is cut into two equal parts and only one part is used in the heater the heat generated now will be 1. doubled 2. four times 3. one fourth 4. halved

Answer»

1. doubled

Resistance of the heater be R.

New resistance of heater is R/2.

Initial power = v² / R

Final power = \(\cfrac{v^2}{\frac{R}{2}}=2\frac{v^2}{R}\)

∴ Heat generated is doubled.

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A heater coil is cut into two equal parts and only one part is used in the heater the heat generated now will be 1. doubled 2. four times 3. one fourth 4. halved

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