CBSE
Multiple Choice QuestionsA capacitor of capacitance 6 µF is charged upto 100 volts. The energy stored in the capacitor is :
0.6 joule
0.06 joule
0.03 joule
0.3 joule
A spherical drop of mercury having a potential of 2.5 V is obtained as a result of merging 125 droplets. The potential of a constituent droplet would be
1.0 V
0.5 V
0.2 V
0.1 V
n small metal drops of same size are charged to V volt each. If they coalesce to form a single large drop, then its potential will be:
Vn
A capacitor is connected to a cell of emf E having some internal resistance r, The potential difference across the :
cell is < E
cell is E
capacitor is > E
capacitor is < E
A solid metal sphere of radius 50 cm carries a charge 25 x 10-10 C, The electrostatic potential at a distance of 20 cm from the centre will be :
25 V
15 V
35 V
45 V
If a positive charge is shifted from a low potential region to a high potential region, the electric potential energy :
decreases
increases
remains the same
may increase or decrease
A parallel plate air capacitor is charged and then isolated. When a dielectric material is inserted between the plates of the capacitor, then which of the following does not change?
Electric field between the plates
Potential difference across the plates
Charge on the plates
Energy stored in the capacitor
Across each of two capacitors of capacitance 1F, a potential difference of 10 V is applied. Then the positive plate of one is connected to the negative plate of the other, and the negative plate of one is connected to the positive plate of the other. After contact :
charge on each is zero
charge on each is same but non zero
charge on each is different but non zero
The capacity of an isolated conducting sphere of radius R is proportional to :
R2
1/R2
1/R
R
Two plates (area = S) charged to + q1 and + q2 (q2 <q1)are brought closer to form a capacitor of capacitance C. The potential difference across the plates is :
