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Standard XII
Physics
Four Fundamental Forces
Question

Two particles each of mass m and carrying charge Q are separated by some distance. If they are in equilibrium under mutual gravitational and electrostatic forces, then Q/m (in C/Kg) is of the order of:


  1. 10−5
  2. 10−15
  3. 10−10
  4. 10−20

A
10−15
B
10−5
C
10−10
D
10−20
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Solution
Verified by Toppr

Given : Gravitational force = Electrostatics force
Let the distance between the rwo charges be r.
⇒G(m)mr2=K Q .Qr2
⇒GK=Q2m2
⇒√6.67×10−119×109=Qm
∴Qm is the order of 10−10

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