Two charges of equal magnitude q are placed in air at a distance 2a apart and third charge -2q is placed at mid-point. The potential energy of the system is (where, ε₀=permitivity of free space) […]
Electric field at a point of distance r from a uniformly charged wire of infinite length having linear charge density λ is directly proportional to
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(a) r⁻¹ (b) r (c) r² (d) […]
Two concentric spheres kept in air have radii R and r. They have similar charge and equal surface charge density σ. The electrical potential at their common centre is (where,ε₀=permitivity of free space)
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If a charge on the body is 1nC, then how many electrons are present on the body?
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(a) 1.6×10¹⁹ (b) 6.25×10⁹ (c) 6.25×10²⁷ (d) 6.25×10²⁸
Correct Answer:
6.25×10⁹
Explanation:
No explanation available. […]
Two charged spheres seperated at a distance d exert a force F on each other. If they are immersed in a liquid of dielectric constant K=2, then the force (if all conditions are same) is […]
Three capacitors of capacitances 3 μF, 10 μF and 15 μF are connected in series to a voltage source of 100V. The charge on 15 μF is
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(a) 500 μC (b) 100 μC […]
An inclined plane of length 5.60m making an angle of 45⁰ with the horizontal is placed in a uniform electric field E=100Vm⁻¹. A particle of mass 1kg and charge 10⁻²C is allowed to slide down […]
If the electric field lines is flowing along axis of a cylinder, then the flux of this field through the cylindrical surface with the axis parallel to the field is [where r=radius of cylinder]
An electron of mass Mₑ, initially at rest, moves through a certain distance in a uniform electric field in time t₁. A proton of mass Mp also initially at rest, takes time t₂ to move […]
A spherical shell of radius 10cm is carrying a charge q. If the electric potential at distance 5cm, 10cm and 15cm from the centre of the spherical shell is V₁,V₂ and V₃ respectively, then
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