important questions from the chapter electric field and intensity
Answers
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Answer:
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Explanation:
For a thin spherical shell of uniform surface charge density σ , The magnitude of E⃗ at a distance r, when r > R (radius of shell) is
E=4πR2σ4πϵ0r3
E=4πR2σ4πϵ0r2
E=R2σ4πϵ0r2
E=4πRσ24πϵ0r2
Two insulated charged copper spheres A and B have their centres separated by a distance of 50 cm. What is the mutual force of electrostatic repulsion if the charge on each is 6.5×10−7C? The radii of A and B are negligible compared to the distance of separation.
3.5×10−2N
4.5×10−2N
1.5×10−2N
2.5×10−2N
A conducting sphere of radius 5 cm is charged to 15 μC. 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
2:1
1:2
1:1
3:1
The unit of charge is
volt
ohm
coulomb
ampere
An electric dipole is
a pair of electric charges of equal magnitude q but positive sign, separated by a distance d
a pair of electric charges of equal magnitude q but opposite sign, separated by a distance
a pair of electric charges of equal magnitude q but negative sign, separated by a distance d
a pair of electric charges of equal magnitude q separated by a distance d
Which orientation of an electric dipole in a uniform electric field would correspond to stable equilibrium?
Is the mass of a body affected on charging?
Two point charges of 3μC each are 100 cm apart. At what point on the line joining the charges will the electric intensity be zero?
What is the basic cause of quantisation of charge?
Calculate the Coulomb force between 2α particles separated by 3.2×10–15m.