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Three capacitors each of capacitance 9 μF are connected in series. (a) What is the total capacitance of the combination? (b) What is the potential difference across each capacitors if the combination is connected to a 120 V supply?
2 years ago
Nilima Nilima
NCERT
Class 12
A parallel plate capacitor with air between the plates has a capacitance of 8 μF. What will be the capacitance if the distance between the plates is reduced by half, and the space between them is filled with a substance of dielectric constant 6?
2 years ago
Nilima Nilima
NCERT
Class 12
A spherical conductor of radius 12 cm has a charge of 1.6 × 10-7 C distributed uniformly on its surface. What is the electric field
2 years ago
Nilima Nilima
NCERT
Class 12
Two charges 2 μC and -2 μC are placed at points A and B 6 cm apart. Identify an equipotential surface of the system. What is the direction of the electric field at every point on this surface?
2 years ago
Nilima Nilima
NCERT
Class 12
A regular hexagon of side 10 cm has a charge 5 μC at each of its vertices. Calculate the potential at the center of the hexagon.
2 years ago
Nilima Nilima
NCERT
Class 12
Two charges 5 × 10-88 C and -3 × 10-8 C are located 16 cm apart. At what point(s) on the line joining the two charges is the electric potential zero? Take the potential at infinity to be zero.
2 years ago
Nilima Nilima
NCERT
Class 12
Suppose that the particle in question 33 is an electron projected with velocity vx = 2.0 × 106 m s-1. If E between the plates separated by 0.5 cm is 9.1 × 102 N C-1 where will the electron strike the upper plate? (|e| = 1.6 × 10-19, me = 9.1 × 10-31 ...
2 years ago
Nilima Nilima
NCERT
Class 12
A particle of mass m and charge (-q) enters the region between the two charged plates initially moving along x-axis with speed vx.The length of plate is L and an uniform electric field £ is maintained between the plates. Show that the vertical deflec...
2 years ago
Nilima Nilima
NCERT
Class 12
(a) Consider an arbitrary electrostatic field configuration. A small test charge is placed at a null point (i.e., where E = o) of the configuration. Show that the equilibrium of the test charge is necessarily unstable, (b) Verify this result for the ...
2 years ago
Nilima Nilima
NCERT
Class 12
It is now believed that protons and neutrons (which constitute nuclei of ordinary matter) are themselves built out of more elementary units called quarks. A proton and a neutron consist of three quarks each. Two types of quarks, the so called ‘up’ qu...
2 years ago
Nilima Nilima
NCERT
Class 12
Obtain the formula for the electric field due to a long thin wire of uniform linear charge density X without using Gauss’s law.
2 years ago
Nilima Nilima
NCERT
Class 12
A hollow charged conductor has a tiny hole cut into its surface. Show that the electric field in the hole is .where \hat { n } is the unit vector in the outward normal direction, and o is the surface charge density near the hole.
2 years ago
Nilima Nilima
NCERT
Class 12
(a) A conductor A with a cavity is shown in figure (a) is given a charge Q. Show that the entire charge must appear on the outer surface of the conductor. (b) Another conductor B with charge q is inserted into the cavity keeping B insulated from A. S...
2 years ago
Nilima Nilima
NCERT
Class 12
In a certain region of space, electric field is along the z-direction throughout. The magnitude of electric field is, however, not constant but increases uniformly along the positive z-direction, at the rate of 105 N C-1 per metre. What are the force...
2 years ago
Nilima Nilima
NCERT
Class 12
Which among the curves shown in Figure cannot possibly represent electrostatic field lines?
2 years ago
Nilima Nilima
NCERT
Class 12
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