EMFT - ECE
Electric and Magnetic Fields
Practice questions from Electric and Magnetic Fields.
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IncorrectA square metal sheet of is placed on the plane as shown in the figure below.
If the surface charge density (in ) on the sheet is , then the total charge (in , rounded off to the nearest integer) on the sheet is _________.
Total charge,
Hence, option (c) is correct.
An electric field of is applied along the length of a copper wire of circular cross-section with diameter 1 mm. Copper has a conductivity of .
The current (in Amperes, rounded off to two decimal places) flowing through the wire is _________.
Given:
Area of conductor,
Hence, option (A) is correct.
Two resistors are connected in a circuit loop of area , as shown in the figure below. The circuit loop is placed on the plane.
When a time-varying magnetic flux, with flux-density (in Tesla), is applied along the positive -axis, the magnitude of current (in Amperes, rounded off to two decimal places) in the loop is _________.
Given: (Tesla), Area
EMF induced in the loop,
Magnitude of current
Let be the unit vectors along x and y axes, respectively and let A be a positive constant. Which one of the following statements is true for the vector fields
Both are electrostatic fields.
Only is an electrostatic field.
Only is an electrostatic field.
Neither is an electrostatic field.
For an electrostatic field,
Curl of result in 0 & curl of is not 0.
Hence, is electrostatic, is not electrostatic.
A uniform plane wave with electric field is travelling in the air (relative permittivity, and relative permeability, ) in the direction ( is a positive constant, is the unit vector along the axis). It is incident normally on an ideal electric conductor (conductivity, ) at . The position of the first null of the total magnetic field in the air (measured from , in metres) is
At perfect conductor,
We know that occurs at
Hance,
So,
So, for 1st value of for H-field to be zero
Now, form equation
Hence
If the reference is not at interference, then
