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Question

Two small and charged blocks of masses m1=m2=20 g and charge q1=0.6 μC and q2=2.4 μC are placed at a distance r=60 cm. Coefficient of friction between block 2 and ground is μ=0.5. Find frictional force between block 2 and ground (assuming initially block 2 is at rest).

A
0.036 N
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B
0.36 N
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C
0.1 N
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D
1 N
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Solution

The correct option is A 0.036 N
F=kq1q2r2
fmax=μmg
F = 9×109×0.6×106×2.4×10636×104×102=36×103 Nfmax = 0.5×20×103×10 =101 N
fmax is less than F. So friction is equal to F=0.036N


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