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A 0.1m long cylindrical resistor is connected across a 12V battery. The resistor has a diameter...

A 0.1m long cylindrical resistor is connected across a 12V battery. The resistor has a diameter of 0.1cm. The resistor is made of copper (resistivity = 1.68 x 10-8  m).

a) Find the current in the resistor.

b) If the resistor is replaced with a resistor of diameter 0.05cm, but otherwise identical to the first resistor, what is the new current in the resistor

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