the size of a carbon block is 1.0cm×1.0cm×50cm.find out the resistance (i)between the square ends of the block. the specific resistance of carbon =3.5×10^-3 ohm cm.
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Answer:
Resistance R=
A
ρl
In first case, R=
(1×10
−2
)×(1×10
−2
)
(3.5×10
−5
)×(50×10
−2
)
=17.5×10
−2
Ω
In 2nd case: R=
(1×10
−2
)×(50×10
−2
)
(3.5×10
−5
)×(1×10
−2
)
=7×10
−5
Ω
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