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A meter scale is balanced at its mid poi...

A meter scale is balanced at its mid point if a 20N weight is balanced at 20 cm mark and a 30 N weight hanged at x cm mark. Calculate the value of x.

A

20 cm

B

70 cm

C

30 cm

D

80 cm

Text Solution

Verified by Experts

The correct Answer is:
B

`m_(1)g=20N,m_(2)g=30NrArrm_(1)gl_(1)=m_(2)gl_(2)`
`therefore20xx300=30l_(2),thereforel_(2)=20cm,`
`thereforex=(50+20)`
= 70 cm
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