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An aluminium (respectively p = 2.2 xx10^...

An aluminium (respectively `p = 2.2 xx10^8 Omega -m`) wire of a diameter 1.4 mm is used to make a `4Omega` resister . The length of the wire is

A

220 m

B

1000m

C

280m

D

1m

Text Solution

Verified by Experts

The correct Answer is:
C
In a merter bridge , P:Q:= 2:3
Balancing condition fr a meter bridge ,
`(p)/(Q)= (l_1)/(100-l_1)`
`(2)/(3) = (l_1)/(100-l_1)`
Rightarrow `l_1 = 40 cm`
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