The electric field near a conducting surface having a uniform surface charge density \(\sigma\) is given by:
1. \(\frac{\sigma}{\varepsilon_0}\) and is parallel to the surface
2. \(\frac{2\sigma}{\varepsilon_0}\) and is parallel to the surface
3. \(\frac{\sigma}{\varepsilon_0}\) and is normal to the surface
4. \(\frac{2\sigma}{\varepsilon_0}\) 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%
From NCERT
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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 |
 91%
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%
From NCERT
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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%
From NCERT
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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 |
 59%
From NCERT
PMT - 2000
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