Class XII

Electric field at a point is defined as
  1. electric force experienced by a charge at that point
  2. electric force per unit charge experienced by a unit charge at that point
  3. electric force experienced by two charges at that point
  4. electric force per unit charge experienced by a unit charge at that point
Ionization of a neutral atom is the
  1. only gain of one or more electrons
  2. gain or loss of one or more electrons
  3. only gain of one or more protons
  4. only gain of one or more neutrons
A conducting sphere of radius 5 cm is charged to 15 μμ C. Another uncharged sphere of radius 10 cm is allowed to touch it for enough time. After the two are separated, the surface density of charge on the two spheres will be in the ratio
  1. 1:2
  2. 2:1
  3. 1:1
  4. 3:1
electrostatic force is
  1. force exerted by one charge on another when the two are accelerating in a given frame of reference
  2. force exerted by one charge on another when the two are moving in a given frame of reference
  3. force exerted by an electron on a neutron
  4. force exerted by one charge on another when the two are at rest in a given frame of reference
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
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