Question

There is a metal block of dimensions 20*10*15cm.Find the ratio of the maximum resistance to the minimum resistance

Answer 1

Explanation:

R=ρ

A

l

for min R=min∣l=min,A=max

for max R=max∣l=max,A=min

Rmin=ρ

50

2

Rmax=ρ

10

10

R

min

R

max

=

25

1

1

25:1

Answer 2

Explanation:

Answer

R=ρ

A

l

for min R=min∣l=min,A=max

for max R=max∣l=max,A=min

Rmin=ρ

50

2

Rmax=ρ

10

10

R

min

R

max

=

25

1

1

25:1