Two particles, each having a mass of 5 g...

Two particles, each having a mass of 5 g and charge. `1.0 xx 10^(-7)` C, stay in limiting wquilibrium on a horizontal. table with a seaprtion of 10 cm between them. The coefficient of friction beteen each partcle and the table. is the same. Find the value of this coefficient.

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Verified by Experts

The electric force on one of the particles due to
the other is
`F = ((9xx 10^9 Nm^2 C^(-2) xx (1.0x 10^(-7) C))^2 x 1/ (0.10m^2)
= 0009N
. The frictional force in limiting equilibrum
`f= mu xx(5x10^(-3)kg) x 9.8 ms^(-2)`
`=(0.049mu)N.`
As these two forces balance each other,
`0.049mu = 0.009`
0r, `mu=0.18.`

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