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Two copper wires A and B have the same length and are connected across the same battery. If

R_B = 8R_A,

determine the following.

HINT

(a)

the ratio of their cross-sectional areas

A_B

A_A

=

(b)

the ratio of their resistivities

?_B

?_A

=

(c)

the ratio of the currents in each wire

I_B

I_A

=

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