A semicircular arc of radius r is charged uniformly and the charge per unit length is λ. The electric field at the centre is:
  • \(\frac{λ}{2λε_0r^2}\)
  • \(\frac{λ}{4πε_0r}\)
  • \(\frac{λ^2}{2πε_0r}\)
  • \(\frac{λ}{2πε_0r}\)
When a dipole of moment \(\vec{p}\) is placed in uniform electric field \(\vec{E}\), then the torque acting on the dipole is:
  • \(\vec{τ}\) = \(\vec{p}\).\(\vec{E}\)
  • \(\vec{τ}\) = \(\vec{P}\) + \(\vec{E}\)
  • \(\vec{τ}\) = \(\vec{p}\) + \(\vec{E}\)
  • \(\vec{τ}\) = \(\vec{p}\) - \(\vec{E}\)
Two point charges +8q and -2q are located at ,v = O and ,v = L respectively. The location of a point on the .v-axis at which the net electric field due to these two point charges b is zero :
  • 4L
  • 8L
  • L/4
  • 2L
The graph drawn between V are r for a non-conducting charged solid sphere of radius R for r < R will be :
  • straight line
  • parabola
  • hyperbola
  • None of these
Corona discharge takes place:
  • at the surface of a conductor
  • near the sharp points of a conductor
  • outside the conductor
  • at the centre of the conductor
The belt of a Vande Graaf generator gets charge by :
  • corona discharge
  • induction
  • electrification
  • None of these
The conservation of electric charge implies that:
  • Charge can't be created
  • Charge can't be destroyed
  • The number of charged particle in the universe is constant
  • Simultaneous creation of equal and opposite charges is permissible
The number of electrons contained in one coulomb of charge is:
  • 6.25 × 1018
  • 6.25 × 1017
  • 6.25 × 1019
  • 1.6 × 1019
The unit of intensity of electric field is :
  • metre/volt
  • Joule/newton
  • Coulomb/newton
  • Newton/coulomb
1 V equals to:
  • 1 J
  • 1 JC-1
  • 1 CJ-1
  • 1 JC
1 V m-1 equals to:
  • 1 N
  • 1 Mm-1
  • 1 NC-1
  • 1 J-1
The minimum amount of charge observed so far is:
  • 1 C
  • 4.8 × 1-13 C
  • 1.6 × 10-19 C
  • 1.6 × 1019 C
The ratio of electric force between two electrons to the gravitational force between them is of the order:
  • 1042
  • 1039
  • 1036
  • 1
0 h : 0 m : 1 s

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