Two capacitors 3μF and 4μF, are individually charged across a 6 V battery. After being disconnected from the battery, they are connected together with the negative plate of one attached to the positive plate of […]
In a parallel plate capacitor with plate area A and charge Q, the force on one plate because of the charge on the other is equal to
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(a) Q²/ε₀A² (b) Q²/2ε₀A² (c) Q²/ε₀A […]
The electric field in a certain region is given by E=5i ̂-3ĵ kV/m. The potential difference Vв-Vᴀ between points A and B, having coordinates (4,0,3)m and (10,3,0)m respectively, is equal to
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(a) […]
A point charge is kept at the centre of a metallic insulated spherical shell. Then
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(a) Electric field outside the sphere is zero (b) Electric field inside the sphere is zero (c) […]
A spherical drop of capacitance 1μF is broken into eight drops of equal radius. Then, the capacitance of each small drop is
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(a) 1/2μF (b) 1/4μF (c) 1/8μF (d) 8μF
Correct Answer: […]
Work done by an external agent in separating the parallel plate capacitor is
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(a) CV (b) 1/2 C²V (c) 1/2 CV² (d) None of these
Correct Answer:
1/2 CV²
Explanation:
Energy stored in […]
When two identical capacitors are in series, they have 3 μF capacitance and when in parallel 12 μF. What is the capacitance of each?
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(a) 6 μF (b) 3 μF (c) 12 μF […]
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 […]
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