An uncharged sphere of metal is placed in between two charged plates as shown. The lines of force look like 

(1) A

(2) B

(3) C

(4) D

Subtopic:  Electric Field |
 76%
From NCERT
PMT - 1985
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The electric field near a conducting surface having a uniform surface charge density σ is given by 

(1) σε0 and is parallel to the surface

(2) 2σε0 and is parallel to the surface

(3) σε0 and is normal to the surface

(4) 2σε0 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 |
 73%
From NCERT
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