A hollow conducting sphere is placed in an electric field produced by a point charge placed at P as shown. Let VA,VB,VC be the potentials at points A,B and C respectively. Then

1. VA<VB<VC

2. VA>VB>VC

3. VC>VB=VA

4. VA=VB=VC

Concept Questions :-

Electric potential
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Four particles each having charge q are placed at the vertices of a square of side a. The value of the electric potential at the midpoint of one of the side will be

1.  0

2.  14πϵ02qa(2+25)

3.  14πϵ02qa(225)

4.  14πϵ02qa(1+15)

Concept Questions :-

Electric potential
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If E be the electric field inside a parallel plate capacitor due to Q and -Q charges on the two plates, then electrostatic force on plate having charge -Q due to the plate having charge +Q will be

(1) -QE

(2) -QE2

(3) QE

(4) -QE4

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If W be the amount of heat produced in the process of charging an uncharged capacitor then the amount of energy stored in it is

(1) 2W

(2) W2

(3) W

(4) zero

Concept Questions :-

Energy stored in capacitor
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A metallic sphere of capacitance C1, charged to electric potential V1 is connected by a metal wire to another metallic sphere of capacitance C2 charged to electric potential V2. The amount of heat produced in the connecting wire during the process is

(1)C1C22C1+C2V1+V22

(2) C1C22(C1+C2)(V1-V2)2

(3) C1C2C1+C2(V1-V2)2

(4) zero

Concept Questions :-

Energy stored in capacitor
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The electric potential at the surface of a charged solid sphere of insulator is 20V. The value of electric potential at its centre will be

1.  30V

2.  20V

3.  40V

4.  Zero

Concept Questions :-

Electric potential
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In the situation shown in the figure, what should be the relation between Q and q so that electric potential at the centre of the square is zero

               

1.  Q = q

2.  Q = 3q

3.  Q = 2q

4.  Q = -3q

Concept Questions :-

Electric potential
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The capacitance of a parallel plate capacitor is C. If a dielectric slab of thickness equal to one-fourth of the plate separation and dielectric constant K is inserted between the plates, then new capacitance become

1. KC2K+1

2. 2KCK+1

3. 5KC4K+1

4. 4KC3K+1

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The electric potential at a point in space due to charge Q is Q × 1012V. The value of an electric field at that point will be

1.  Q9×1012NC

2.  Q9×1015NC

3.  Q9×109NC

4.  Q ×1015NC

Concept Questions :-

Relation between field and potential
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The electric potential at a point at distance 'r' from a short dipole is proportional to

(1) r2

(2) r-1

(3) r-2

(4) r1

Concept Questions :-

Electric potential
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