GATE EE
Electromagnetic Fields
Magnetostatics
Previous Years Questions

## Marks 1

A long conducting cylinder having a radius b is placed along the z-axis. The current density is $$\overrightarrow J = {J_a}{r^3}\widehat z$$ for the ...
If the magnetic field intensity ($$\overrightarrow H$$) in a conducting region is given by the expression, $$\overrightarrow H = {x^2}\widehat i + {... The figures show diagrammatic representations of vector fields$$\overrightarrow X,\;\overrightarrow Y,\;and\;\overrightarrow Z$$respectively. Which ... A solid iron cylinder is placed in a region containing a uniform magnetic field such that the cylinder axis is parallel to the magnetic field directio... A steady current I is flowing in the −x direction through each of two infinitely long wires at$$y=\pm\frac L2$$as shown in the figure. The permeabil... The flux density at a point in space is given by$$\overrightarrow B=\;4x{\widehat a}_x\;+\;2ky{\widehat a}_y\;+\;8{\widehat a}_z\;\;Wb/m^2$$. The val... Which of the following statements holds for the divergence of electric and magnetic flux densities? The inductance of a long solenoid of length$$1000mm$$wound uniformly with$$3000$$turns on a cylindrical paper tube of$$60mm$$diameter ... Two conductors are carrying forward and return current of$$ + {\rm I}$$and$$ - {\rm I}$$as shown in Fig. The magnetic field intensity$$\overrigh...
An electron with velocity $$'u'$$ is placed in an electric field, $$E$$ and magnetic field, $$B.$$ The force experienced by the electron is given by
Two parallel wires separated by a distance $$'d'$$ are carrying a current $$'{\rm I}'$$ in the same direction. The magnetic field along a line runnin...
The energy stored in the magnetic field of solenoid $$30$$ $$cm$$ long and $$3$$ $$cm$$ diameter wound with $$1000$$ turns of wire carrying a current ...
Static magnetic fields induce currents in closed conducting loops.
The line integral of the vector potential A around the boundary of a surface S represents

## Marks 2

The magnitude of magnetic flux density (B) in micro Teslas ( µT ) at the center of a loop of wire wound as a regular hexagon of side length 1 m carryi...
The magnitude of magnetic flux density ($$\overrightarrow B$$) at a point having normal distance d meters from an infinitely extended wire carrying cu...
The following four vector fields are given in cartesian coordinate system. The vector field which does not satisfy the property of magnetic flux densi...
A coil of 300 turns is wound on a non-magnetic core having a mean circumference of 300 mm and a cross-sectional area of 300 mm2. The inductance the co...
An inductor designed with $$400$$ turns coil wound on an iron core of $$16\,\,c{m^2}$$ cross sectional area and with a cut of an air gap length of $$1... An inductor designed with$$400$$turns coil wound on an iron core of$$16\,\,c{m^2}$$cross sectional area and with a cut of an air gap length of$$1...
The conductors of a $$10$$ $$km$$ long, single phase, two wire line are separated by a distance of $$1.5$$ $$m.$$ The diameter of each conductor is $$... ## Marks 5 The magnetic vector potential in a region is defined by$$\overrightarrow A = {e^{ - y}}\sin \left( x \right){\widehat a_z}.$$An infinitely long co... A current$${\rm I}$$in the short conducting element shown in Fig. produces a flux density$${B_1}$$at point$$1.$$Determine the magnitude and the... An electron moves in the$$X$$-$$Y$$plane with a speed of$${10^6}\,\,m/s.$$Its velocity vector makes an angle of$${60^ \circ }$$with$$X$$axis. ... A infinitely long straight wire carries$$1000A$$of current and in the vicinity, there is a circular conducting loop of$$100mm diameter...
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