Two equally charged, identical metal spheres A and B repel each other with a force 'F'. The spheres are kept fixed with a distance 'r' between them. A third identical, but uncharged sphere C is brought in contact with A and then placed at the mid-point of the line joining A and B. The magnitude of the net electric force on C is 

(1) F

(2) 3F/4

(3) F/2

(4) F/4

Subtopic:  Electric Field |
 56%
From NCERT
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An infinite number of charges, each of charge 1 μC,1 μC, are placed on the x-x-axis with co-ordinates x=1,2,4,8,.....x=1,2,4,8,..... If a charge of 1 C1 C is kept at the origin, then what is the net force acting on 1 C1 C charge?
1. 9000 N9000 N 2. 12000 N12000 N
3. 24000 N24000 N 4. 36000 N36000 N
Subtopic:  Coulomb's Law |
 68%
From NCERT
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A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equilibrium, if q is equal to 

(1) Q2Q2

(2) Q4Q4

(3) +Q4+Q4

(4) +Q2+Q2 

Subtopic:  Coulomb's Law |
 67%
From NCERT
PMT - 1995
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The figure shows the electric lines of force emerging from a charged body. If the electric fields at A and B are EA and EB respectively and if the distance between A and B is r, then:


1. EA > EBEA > EB
2. EA < EBEA < EB
3. EA = EBrEA = EBr
4. EA = EBr2EA = EBr2

Subtopic:  Electric Field |
 88%
From NCERT
PMT - 1986
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ABCABC is an equilateral triangle. Charges +q+q  are placed at each corner. The electric intensity at OO will be: 

       

1. 14πϵ0qr214πϵ0qr2 2. 14πϵ0qr14πϵ0qr
3. zero 4. 14πϵ03qr214πϵ03qr2
Subtopic:  Electric Field |
 88%
From NCERT
PMT - 1985
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The magnitude of electric field intensity E is such that, an electron placed in it would experience an electrical force equal to its weight is given by 

(1) mge

(2) mgemge

(3) emgemg

(4) e2m2ge2m2g

Subtopic:  Electric Field |
 83%
From NCERT
PMT - 1975
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A charged particle is free to move in an electric field. It will travel:
1. Always along a line of force
2. Along a line of force, if its initial velocity is zero
3. Along a line of force, if it has some initial velocity in the direction of an acute angle with the line of force
4. None of the above
Subtopic:  Electric Field |
From NCERT
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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 |
 77%
From NCERT
PMT - 1985
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The electric field near a conducting surface having a uniform surface charge density σσ is given by:
1. σε0σε0 and is parallel to the surface
2. 2σε02σε0 and is parallel to the surface
3. σε0σε0 and is normal to the surface
4. 2σε02σε0 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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