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Question

Surface tension of liquid is 70 dyne/cm. Its value in SI is

A
70 N/m
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B
7×102 N/m
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C
7×102 N/m
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D
7×103 N/m
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Solution

The correct option is B 7×102 N/m
As we know that 1 N=105 dyne and 1 m=100 cm
Putting the values we have surface tension in SI as
70×105 N102 m=7×102 N/m

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