EMFT EE
Magnetostatics
Practice questions from Magnetostatics.
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IncorrectAn air filled cylindrical capacitor (capacitance ) of length , with and as its inner and outer radii, respectively, consists of two coaxial conducting surfaces. Its cross-sectional view is shown in Fig. (i). In order to increase the capacitance, a dielectric material of relative permittivity is inserted inside of the annular region as shown in Fig. (ii). The value of for which the capacitance of the capacitor in Fig. (ii), becomes is
It is given that
Since half of the region is filled with air and half with a dielectric the two parts can be considered to be connected in parallel and the capacitance is equally divided as
Option (c) is contest.
The given equation represents a magnetic field strength in the spherical coordinate system, in free space. Here, and represent the unit vectors along and , respectively. The value of in the equation should be ________ (rounded off to the nearest integer).
For a magnetic field,
In the figure, the electric field and the magnetic field point to and directions, respectively, and have constant magnitudes. A positive charge ' ' is released from rest at the origin. Which of the following statement(s) is/are true.
The charge will move in the direction of with constant velocity.
The charge will always move on the plane only.
The trajectory of the charge will be a circle.
The charge will progress in the direction of .
MTA
An infinite surface of linear current density exists on the plane, as shown in the figure. The magnitude of the magnetic field intensity at a point due to the surface current in Ampere/meter is __________ (Round off to 2 decimal places).
Magnetic field intensity due to surface current density kA/m is
