Question

The ratio of resistivity of two
materials A and B is 1:2 ratio of
their length is 3:4 & if of the
radius is 2: 3. Then the ratio.
of resistance of A and B​

Answer 1

Answer:

27/32

Explanation:

The formula of resistance R=¶l/A

So you have ¶1/¶2=1/2

l1/l2=3/4&r1/r2=2/3

so area A1/A2=r1²/r2²=4/3

So R1/R2= ¶1(l1)A2/¶2(l2)A1

=1*3*9/2*4*4=27/32