Question

A force F is applied on a square area of side L. If
the percentage error in the measurement of L is
2% and that in Fis 4%, what is the maximum
percentage error in pressure?
(2) 4%
(1) 2%
(3) 6%
(4) 8%​

Answer 1

Percentage error in L=2%

Percentage error in F=4%

We know that, P=

A

F

​

=

L

2

F

​

P

△P

​

×100=

F

△F

​

×100+2

L

△L

​

×100

=[4+2(2)]% = 8%.