If the tungsten filament of a lamp has a cross sectional area of 5 x 10 9m2, how long must it be to have a resistance of 120 Q at 20C If the tungsten filament of a lamp has a cross sectional area of 5 x 10 9m2, how long must it be to have a resistance of 120 Q at 20C If the tungsten filament of a ...

Ans The resistance R of a wire is given by the formula R A L where R ...

If the tungsten filament of a lamp has a cross-sectional area of 5 x 10-9m2, how...

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If the tungsten filament of a lamp has a cross-sectional area of 5 x 10-9m2, how...

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