The ratio of electric force to the gravitational force between two protons separated by a finite distance is of the order of:
A
10−19
B
10+19
C
10−36
D
10+36
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Solution
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Gravitationalforce=G(mp)2r2 Electricforce=K(e)(e)r2 Ratio=K(1.6×10−19)2r2×r2G×(1.67×10−27)2 =(9×109)×(1.6×10−19)2(6.67×10−11)(1.67×10−27)2 =1.23×1020×1016 =1036(order of magnitude)
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