Two capacitors of capacitances 2 μF and 3 μF are joined in series. Outer plate of first capacitor is at 1000 volt and outer plate of second capacitor is earthed (grounded). Now the potential on […]
The unit of electric permittivity is
Options
(a) volt/m² (b) joule/coulomb (c) farad/m (d) henry/m
Correct Answer:
farad/m
Explanation:
Electric permitivity has unit farad/m.
The electric potential at the surface of an atomic nucleus (z=50) of radius 9.0×10⁻¹³ cm is
Options
(a) 80 volt (b) 8×10⁶ volt (c) 9 volt (d) 9×10⁵ volt
Correct Answer:
8×10⁶ volt
Explanation: […]
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
Options
(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
Options
(a) […]
A point charge is kept at the centre of a metallic insulated spherical shell. Then
Options
(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
Options
(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
Options
(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?
Options
(a) 6 μF (b) 3 μF (c) 12 μF […]
2017 Copyright Doctor Dreams Training Academy