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

Concept Questions :-

Electric field
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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 

Concept Questions :-

Electric field
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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

Concept Questions :-

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

Concept Questions :-

Electric field
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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

Concept Questions :-

Electric field
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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) 5μ Cm–2

(3) 20μ Cm–2

(4) 8μ Cm–2

Concept Questions :-

Electric field
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An electron of mass me initially at rest moves through a certain distance in a uniform electric field in time t1. A proton of mass mp also initially at rest takes time t2 to move through an equal distance in this uniform electric field. Neglecting the effect of gravity, the ratio of t2/ t1 is nearly equal to 

(1) 1

(2) (mp/me)1/2

(3) (me/mp)1/2

(4) 1836

Concept Questions :-

Electric field
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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

Concept Questions :-

Coulomb's law
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Three identical 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

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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

Concept Questions :-

Electric field
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