Advertisements
Advertisements
प्रश्न
A capacitor has been charged by a dc source. What are the magnitude of conduction and displacement current, when it is fully charged?
Advertisements
उत्तर
Elecric flux through plates of capacitor, `φ_E = q/ε_o`.
Here, q = constant, the capacitor is fully charged.
Displacement current , `I_D= ε_o (dφ_E)/dt = ε_od((q/ε_o)/dt) = 0 `
Contduction current, `I = c (dv)/dt = 0` as volatage becomes constant
when the capacitor becomes fully charged.
APPEARS IN
संबंधित प्रश्न
A parallel plate capacitor (Figure) made of circular plates each of radius R = 6.0 cm has a capacitance C = 100 pF. The capacitor is connected to a 230 V ac supply with a (angular) frequency of 300 rad s−1.
- What is the rms value of the conduction current?
- Is the conduction current equal to the displacement current?
- Determine the amplitude of B at a point 3.0 cm from the axis between the plates.
When an ideal capacitor is charged by a dc battery, no current flows. However, when an ac source is used, the current flows continuously. How does one explain this, based on the concept of displacement current?
A cylinder of radius R, length Land density p floats upright in a fluid of density p0. The cylinder is given a gentle downward push as a result of which there is a vertical displacement of size x; it is then released; the time period of resulting (undampe (D) oscillations is ______.
Displacement current goes through the gap between the plantes of a capacitors. When the charge of the capacitor:-
A capacitor of capacitance ‘C’, is connected across an ac source of voltage V, given by V = V0 sinωt The displacement current between the plates of the capacitor would then be given by ______.
The charge on a parallel plate capacitor varies as q = q0 cos 2πνt. The plates are very large and close together (area = A, separation = d). Neglecting the edge effects, find the displacement current through the capacitor?
A variable frequency a.c source is connected to a capacitor. How will the displacement current change with decrease in frequency?
Show that the magnetic field B at a point in between the plates of a parallel-plate capacitor during charging is `(ε_0mu_r)/2 (dE)/(dt)` (symbols having usual meaning).
Show that average value of radiant flux density ‘S’ over a single period ‘T’ is given by S = `1/(2cmu_0) E_0^2`.
A particle is moving with speed v = b`sqrtx` along positive x-axis. Calculate the speed of the particle at time t = τ (assume that the particle is at origin at t = 0).
