MCQ
The displacement current flows in the dielectric of a capacitor when the potential difference across its plates.
- Abecomes zero
- Bhas assumed a constant value
- Cis increasing with time
- Dis decreasing with time
✓
Answer
- is increasing with time
Explanation:
According to Maxwell's hypothesis, a displacement current will flow through a capacitor when the potential difference across its plates is varying. Thus a varying electric field will exist between the plates and this displacement current is same in magnitude to the current flowing in outer circuit. When a D.C voltage applied across its plates, constant voltage appears across its plates and so there will be no displacement current flowing through the capacitor. Thus the displacement current will flow when the potential is increasing with time.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A combination of two thin lenses of the same material with focal lengths 
and 
, arranged on a common axis minimizes chromatic aberration, if the distance between them is
|
(a) |
(b) |
(c) ( |
(d) |
The moment of inertia of a uniform semicircular wire of mass M and radius r about a line perpendicular to the plane of the wire through the centre is:
→-
$\text{Mr}^2$
-
$\frac{1}{2}\text{Mr}^2$
-
$\frac{1}4{}\text{Mr}^2$
-
$\frac{2}{5}\text{Mr}^2$
Two magnets, each of magnetic moment ‘M’ are placed so as to form a cross at right angles to each other. The magnetic moment of the system will be
|
(a) 2M |
(b) |
(c) 0.5 M |
(d) M |
When light rays from the sun fall on a convex lens along a direction parallel to its axis
|
(a) Focal length for all colours is the same |
|
(b) Focal length for violet colour is the shortest |
|
(c) Focal length for yellow colour is the longest |
|
(d) Focal length for red colour is the shortest |
Two photons having:
- Equal wavelengths have equal linear momenta.
- Equal energies have equal linear momenta.
- Equal frequencies have equal linear momenta.
- Equal linear momenta have equal wavelengths.
Which of the following helps us in the determination of the temperature of sun
|
(a) Kirchhoff's law |
(b) Maxwell Boltzmann law |
|
(c) Planck's law |
(d) Stefan's law |
A capacitor having capacitance C is charged to a voltage V. It is then removed and connected in parallel with another identical capacitor which is uncharged. The new charge on each capacitor is now
|
(a) CV |
(b) CV / 2 |
(c) 2 CV |
(d) CV / 4 |
The magnetic dipole moment of a current carrying coil does not depend upon:
Two point charges of 20μC and 80 μC are 10 cm apart. Where will the electric field strength be zero on the line joining the charges from 20 μC charge
|
(a) 0.1 m |
(b) 0.04 m |
(c) 0.033 m |
(d) 0.33 m |
A radioactive element 
decay into 
. The number of β - particles emitted are
|
(a) 4 |
(b) 6 |
(c) 2 |
(d) 1 |