# The electric field near a conducting surface having a uniform surface charge density σ is given by  (1) $\frac{\sigma }{{\epsilon }_{0}}$ and is parallel to the surface (2) $\frac{2\sigma }{{\epsilon }_{0}}$ and is parallel to the surface (3) $\frac{\sigma }{{\epsilon }_{0}}$ and is normal to the surface (4) $\frac{2\sigma }{{\epsilon }_{0}}$ and is normal to the surface

Subtopic:  Electric Field |
77%
From NCERT
PMT - 1994
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The magnitude of electric field E in the annular region of a charged cylindrical capacitor

(1) Is same throughout

(2) Is higher near the outer cylinder than near the inner cylinder

(3) Varies as 1/r, where r is the distance from the axis

(4) Varies as 1/r2, where r is the distance from the axis

Subtopic:  Electric Field |
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A metallic solid sphere is placed in a uniform electric field. The lines of force follow the path(s) shown in figure as

(1) 1

(2) 2

(3) 3

(4) 4

Subtopic:  Electric Field |
85%
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The figure shows some of the electric field lines corresponding to an electric field. The figure suggests

(1) EA > EB > EC

(2) EA = EB = EC

(3) EA = EC > EB

(4) EA = EC < EB

Subtopic:  Electric Field |
79%
From NCERT
PMT - 1999
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A hollow insulated conducting sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters

(1) Zero

(2) 5 μCm–2

(3) 20 μCm–2

(4) 8 μCm–2

Subtopic:  Electric Field |
90%
From NCERT
PMT - 1998
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An electron of mass $$m_{e}$$ initially at rest, moves through a certain distance in a uniform electric field in time $$t_{1}.$$ A proton of mass $$m_{p}$$ also initially at rest takes time $$t_{2}$$ to move through an equal distance in this uniform electric field. The ratio of $$\frac{t_{2}}{t_{1}}$$ is nearly equal to- (Neglect the effect of gravity.)

1. $$1$$
2. $$\left ( \frac{m_{p}}{m_{e}} \right )^{1/2}$$
3. $$\left ( \frac{m_{e}}{m_{p}} \right )^{1/2}$$
4. $$1836$$

Subtopic:  Electric Field |
61%
From NCERT
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Point charges +4q, –q and +4q are kept on the x-axis at points x = 0, x = a and x = 2a respectively, then:

(1) only -q is in stable equilibrium.

(2) none of the charges are in equilibrium.

(3) all the charges are in unstable equilibrium.

(4) all the charges are in stable equilibrium.

Subtopic:  Coulomb's Law |
From NCERT
PMT - 1992
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Three identical positive point charges, as shown are placed at the vertices of an isosceles right-angled triangle. Which of the numbered vectors coincides in direction with the electric field at the mid-point $$M$$ of the hypotenuse?

1. $$1$$
2. $$2$$
3. $$3$$
4. $$4$$

Subtopic:  Electric Field |
78%
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The figures below show regular hexagons, with charges at the vertices. In which of the following cases the electric field at the centre is not zero?

(1) 1

(2) 2

(3) 3

(4) 4

Subtopic:  Electric Field |
74%
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An electron enters an electric field with its velocity in the direction of the electric lines of force. Then:

 1 the path of the electron will be a circle. 2 the path of the electron will be a parabola. 3 the velocity of the electron will decrease. 4 the velocity of the electron will increase.

Subtopic:  Electric Field |
58%
From NCERT
PMT - 2000
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