Question

3) 4.
15. If L = (20 +0.01)m and B =(10+0.02)m
then L-B is
1) (10+0.01)m 2) (30+ 0.02)m

3) (10+0.02)m 4) (10+0.03)m
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Answer 1

The value of L - B is (10 + 0.03)m

Explanation:

We are given that:

• L = (20 +0.01)m
• B = (10+0.02)m

To Find: L - B =?

Solution:

• L - B = (20 +0.01)m  - (10+0.02)m
• L - B = 10

• Error in tehasurement of L = ΔL= 0.01 m
• Error in the measurement of B = ΔB = 0.02 m

Now

Δm = ΔL + ΔB = 0.01 + 0.02 = 0.03

Therefore,

L-B = (10 + 0.03)m

Thus the value of L - B is (10 + 0.03)m