A hollow conducting sphere is placed in an electric field produced by a point charge placed at P as shown in the figure. Let\(​​V_A ~,V_B~,V_C\) be the potentials at points A, B and C respectively. Then:

    
1. \(V_A<V_B<V_C\)
2. \(V_A>V_B>V_C\)
3. \(V_C>V_B=V_A\)
4. \(V_A=V_B=V_C\)

Subtopic:  Electric Potential |
 67%
From NCERT
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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)

Subtopic:  Electric Potential |
From NCERT
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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

Subtopic:  Electric 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

Subtopic:  Electric Potential |
 63%
From NCERT
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A hollow charged metal spherical shell has radius R. If the potential difference between its surface and a point at a distance 3R from the center is V, then the value of electric field intensity at a point at distance 4R from the center is

1.  3V19R

2.  V6R

3.  3V32R

4.  3V16R

Subtopic:  Electric Potential |
 52%
From NCERT
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Two metallic spheres of radii 2cm and 3cm are given charges 6mC and 4mC respectively. The final charge on the smaller sphere will be if they are connected by a conducting wire

(1) 4mC

(2) 6mC

(3) 5mC

(4) 10mC

Subtopic:  Electric Potential |
 57%
From NCERT
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When a proton at rest is accelerated by a potential difference \(V\), its speed is found to be \(v\). The speed of an \(\alpha-\textit{particle}\) when accelerated by the same potential difference from rest will be: 

1. \(V\) 2. \(v \over \sqrt{2}\)
3. \(v \sqrt{2}\) 4. \(2V\)
Subtopic:  Electric Potential |
 60%
From NCERT
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A and B are two concentric metallic shells. If A is positively charged and B is earthed, then electric

                                             

1.  Field at common centre is non-zero

2.  Field outside B is nonzero

3.  Potential outside B is positive

4.  Potential at common centre is positive

Subtopic:  Electric Potential |
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The electric potential at a point at distance 3R from the centre of disc
of radius R lying in the axis of the disc whose surface charge density is σ
will be given by:
1. σ2ε02-3R                          2. σ2ε02+3R
3.σ2ε03-2R                           4. σ2ε03+2R

Subtopic:  Electric Potential |
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Two spheres of radius a and b respectively are charged and joined by a wire. The ratio of the electric field at the surface of the spheres is 

(1) a/b

(2) b/a

(3) a2/b2

(4) b2/a2

Subtopic:  Electric Potential |
 56%
From NCERT
PMT - 1999
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