Class XII

Electric charges are of
  1. 2 types
  2. 5 types
  3. 3 types
  4. 4 types
For charges q1and q2q1and q2 separated by a distance R the magnitude of the electrostatic force is given by
  1. F = . q1q2 4πϵ0R2
  2. F = q1 4πϵ0R2
  3. F = q1q2 4πϵ0R
  4. F = q1q2 4πϵ0R3
An electric dipole in an electric field experiences a torque τ⃗
  1. equal to the scalar product of E⃗ E→ and p⃗
  2. equal to the scalar product of p⃗ p→ and E⃗
  3. equal to the vector product of E⃗ E→ and p⃗
  4. equal to the vector product of p⃗ p→ and E⃗
In charging by Induction
  1. a metallic object is charged by rubbing it with silk
  2. a metallic object by touching touching with a charged object
  3. a metallic object is charged by rubbing it with fur
  4. a metallic object is charged by bringing a charged object near it
The unit of charge is
  1. volt
  2. ampere
  3. ohm
  4. coulomb
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