Charge Q is divided into two parts which are then kept some distance apart. The force between them will be maximum, if the two parts are having the charge
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(a) Q/2 each […]
An electric dipole of dipole moment p is aligned parallel to a uniform electric field E. The energy required to rotate the dipole by 90⁰ is
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(a) p E² (b) p² E […]
A sphere of 4cm radius is suspended with in a hollow sphere of 6cm radius. If the inner sphere is charged to a potential 3esu while the outer sphere is earthed, then the charge on […]
A soap bubble is charged to a potential 12V. If its radius is doubled, then the potential of the bubble becomes
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(a) 12V (b) 24V (c) 3V (d) 6V
Correct Answer:
6V
A parallel plate capacitor as a uniform electric field E in the space between the plates. If the distance between the plates is d and area of each plate is A, the energy stored in […]
Two metallic spheres of radii 1 cm and 3 cm are given charges of -1 x 10⁻² C and 5 x 10⁻² C, respectively. If these are connected by a conducting wire, the final charge […]
The concentric spheres of radii R and r have positive charges q₁ and q₂ with equal surface charge densities. What is the electric potential at their common centre?
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(a) σ/ε₀(R+r) (b) σ/ε₀(R-r) […]
A rod lies along the X-axis with one end at the origin and the other at x→∞. It carries a uniform charge λCm⁻¹. The electric field at the point x=-a on the axis will be […]
The potential energy of particle in a force field is U = A/r² – b/r, where A and B are positive constants and r is the distance of particle from the centre of the field. […]
Two metal spheres of radii 0.01m and 0.02m are given a charge of 15mC and 45mC, respectively. They are then connected by a wire. The final charge on the first sphere is……x10⁻³C.
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