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please help me asap :)

really need it.

A block of carbon is 3.6 cm long and has
a square cross-sectional area with sides of
6.2 cm. A potential difference 7.5 V is main-
tained across its length.
What is the resistance of the resistor? The
resistivity of carbon is 4.8 x 10¯° 2 - m

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