The potential at a certain point in an electric field is 200 V. The work done in carrying an electron upto that point will be.

1.  3.2×10-17 J                      

2.  -3.2×10-17 J

3.  200 J                                     

4.  -200 J

Subtopic:  Electric Potential |
 68%
From NCERT
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Two charged conducting spheres of radii r1 and r2 are at the same potential. The ratio of their surface charge densities will be -

1.  r1/r2                               

2.  r2/r1

3.  r12/r22                           

4.  r22/r12

Subtopic:  Electric Potential |
 70%
From NCERT
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At the mid point of a line joining an electron and a proton, the values of E and V will be.

1. E=0, V0                   

2. E0, V=0

3. E0, V0                   

4. E=0, V=0

Subtopic:  Electric Potential |
 73%
From NCERT
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A charge of 10µC is kept at the origin of XY coordinate system. The potential difference in volts between two points (a, 0) and a/2 , a/2 will be.

1.  Zero                             

2.  9×104

3.  9×104a                           

4.  9×1042

Subtopic:  Electric Potential |
 66%
From NCERT
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Find equivalent capacitance between X and Y if each capacitor is 4 μF.

    

1.  4 μF                                     

2.  2 μF

3.  12 μF                                   

4.  1 μF

Subtopic:  Combination of Capacitors |
 69%
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Two point charge of 8 μC and 12 μC are kept in air at a distance of 10 cm from each other. The work required to change the distance between them to 6 cm will be.

1.  5.8 J                       

2.  4.8 J

3.  3.8 J                       

4.  2.8 J

Subtopic:  Electric Potential Energy |
 68%
From NCERT
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Two parallel plate capacitors of capacitances C and 2C are connected in parallel and charged to a potential difference V. The battery is then disconnected and the region between the plates of the capacitor C is completely filled with a material of dielectric constant K. The potential difference across the capacitors now becomes –

1.  3VK+2                             

2.  KV

3.  VK                                 

4.  3KV

Subtopic:  Dielectrics in Capacitors | Combination of Capacitors |
 67%
From NCERT
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Maximum charge stored on a metal sphere of radius 15 cm may be 7.5 µC. The potential energy of the sphere in this case is :

1.  9.67 J                   

2.  0.25 J 

3.  3.25 J                    

4.  1.69 J

Subtopic:  Electric Potential Energy |
From NCERT
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Four identical particles each of mass m and charge q are kept at the four corners of a square of length L. The final velocity of these particles after setting them free will be.

1. Kq2mL5.41/2                           

2. Kq2mL1.351/2

3. Kq2mL2.71/2                           

4. Zero

Subtopic:  Electric Potential Energy |
From NCERT
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A parallel plate capacitor is charged to a certain potential difference. A slab of thickness 3 mm is inserted between the plates and it becomes necessary to increase the distance between the plates by 2.4 mm to maintain the same potential difference. The dielectric constant of the slab is– 

1.  3                   

2.  5 

3.  2.5               

4.  2

Subtopic:  Dielectrics in Capacitors |
 60%
From NCERT
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