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Question

# The ratio of electric force to the gravitational force between two protons separated by a finite distance is of the order of:10−1910+1910−3610+36

A
1019
B
10+36
C
10+19
D
1036
Solution
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#### Gravitational force =G(mp)2r2Electric force =K(e)(e)r2Ratio =K(1.6×10−19)2r2×r2G×(1.6 7×10−27)2=(9×109)×(1.6×10−19)2(6.6 7×10−11)(1.6 7×10−27)2=1.23×1020×1016=1036(order of magnitude)

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