GATE EE
Electromagnetic Fields
Electrostatics
Previous Years Questions

## Marks 1

As shown in the figure below, to concentric conducting spherical shells, centred at r = 0 and having radii r = c and r = d are maintained at potential...
A positive charge of 1 nC is placed at (0, 0, 0.2) where all dimensions are in metres. Consider the x - y plane to be a conducting ground plane. Take...
Consider a solid sphere of radius 5 cm made of a perfect electric conductor. If one million electrons are added to this sphere, these electrons will b...
Consider an electron, a neutron and a proton initially at rest and placed along a straight line such that the neutron is exactly at the center of the ...
Match the following. ...
Two semi-infinite dielectric regions are separated by a plane boundary at y = 0. The dielectric constants of region 1 (y< 0) and region 2 (y>0) ...
Consider a function $$\overrightarrow f=\frac1{r^2}\widehat r$$ where r is the distance from the origin and $$\widehat r$$ is the unit vector in the r...
A hollow metallic sphere of radius r is kept at potential of 1 Volt. The total electric flux coming out of the concentric spherical surface of radius ...
A parallel plate capacitor consisting two dielectric materials is shown in the figure. The middle dielectric slab is place symmetrically with respect ...
Divergence of the three-dimentional radial vector field $$\overrightarrow F$$ is
Divergence of the vector field $$\overrightarrow V\left(x,y,z\right)=-\left(x\cos xy\;+\;y\right)\;\widehat i\;+\;\left(y\cos xy\right)\;\widehat j\;... A parallel plate capacitor is shown in Fig. It is made of two square metal plates of$$400mm$$side. The$$14mm$$space between the plates i... Given a vector field$$\overrightarrow F ,$$the divergence theorem states that In a uniform electric field, field lines and equipotentials If v, w, q stand for voltage, energy and charge, then v can be expressed In electrostatic field$$\nabla\times\overrightarrow E\equiv0$$Which of the following equations represents the Gauss's law in a homogeneous isotropic medium? An electrostatic potential is given by$$\phi=2x\sqrt y$$volt in the rectangular co-ordinate system. The magnitude of the electric field at x = 1 m,y... ## Marks 2 The capacitance of an air-filled parallel-plate capacitor is 60 pF. When a dielectric slab whose thickness is half the distance between the plates, is... A thin soap bubble of radius R = 1 cm, and thickness a = 3.3 µm(a << R), is at a potential of 1 V with respect to a reference point at infinity.... Two electric charges q and -2q are placed at (0,0) and (6,0) on the x-y plane. The equation of the zero equipotential curve in the x-y plane is Two semi-infinite conducting sheets are placed at right angles to each other as shown in the figure. A point charge of +𝑄 is placed at a distance of ... A parallel plate capacitor is partially filled with glass of dielectric constant 4.0 as shown below. The dielectric strengths of air and glass are 30 ... A perfectly conducting metal plate is placed in x-y plane in a right handed coordinate system. A charge of$$+32{\mathrm{πε}}_0\sqrt2$$columbs is pla... A dielectric slab with 500 mm x 500 mm cross-section is 0.4 m long. The slab is subjected to a uniform electric field of$$E=6{\widehat a}_x+8{\wideha...
A capacitor is made with a polymeric dielectric having an $$\varepsilon_0$$ of 2.26 and a dielectric breakdown strength of 50 kV/cm. The permittivity ...
$$F\left(x,y\right)=\left(x^2\;+\;xy\right)\;{\widehat a}_x\;+\;\left(y^2\;+\;xy\right)\;{\widehat a}_y$$$. Its line integral over the straight line ... A capacitor consists of two metal plates each $$500 \times 500\,\,m{m^2}$$ and spaced $$6$$ $$mm$$ apart. The space between the metal plates is filled... Two point charges $${Q_1} = 10\,\,\mu C$$ and $${Q_2} = 20\,\,\mu C$$ are placed at coordinates $$(1,1,0)$$ and $$\left( { - 1, - 1,0} \right)$$ respe... A solid sphere made of insulating material has a radius $$R$$ and has a total charge $$Q$$ distributed uniformly in its volume. What is the magnitude ... A parallel plate capacitor has an electrode area of $$100$$ $$m{m^2}$$, with a spacing of $$0.1$$ $$mm$$ between the electrodes. The dielectric betwee... A point charge of $$+1$$ $$nC$$ is placed in a space with a permittivity of $$8.85 \times {10^{ - 12}}\,F/m$$ as shown in Fig. The potential differenc... A composite parallel plate capacitor is made up of two different dielectric materials with different thickness ($${t_1}$$ and $${t_2}$$) as shown in F... The electric field $$\overrightarrow E$$ (in volts/metre) at the point $$(1, 1, 0)$$ due to a point charge of $$+1$$ $$\mu C$$ located at $$\left( {... Given the potential function in free space to be$$V\left( x \right) = \left( {50{x^2} + 50{y^2} + 50{z^2}} \right)$$volts, the magnitude (in volts ... The capacitance of an isolated sphere of radius 10 cm in air is equal to _____ pF. The capacitance of the arrangement shown in Fig. is ...................$$pF$$... ## Marks 5 Show via the construction of a suitable Gaussian surface, that the capacitance of a spherical capacitor consisting of two concentric shells of radii ... A charge$$+Q$$is uniformly distributed throughout the volume of a dielectric sphere of radius$$R$$and dielectric constant$$'{\varepsilon _R}'.$$... An infinite number of charges, each equal to$$'q'$$are placed along the$$x=1,x=2, x=4, x=8, x=16$$and so on, Find the potential and electric field... Determine the electric field intensity at the point$$P$\$ for the arrangement shown in Fig. ...
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