A proton and an α-particle are at a distance r from each other. After letting them free if they move to infinity, the kinetic energy of the proton will be -

1.  8Ke2/5r                           

2.  2Ke2/5r

3.  8Ke2/r                             

4.  Ke2/5r

Subtopic:  Electric Potential Energy |
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103 small water drops, each of radius r and each carrying charge q, combine to form one bigger drop. The potential of a bigger drop as compared to that of a smaller drop will be.

1.  105 V                     

2.  103 V

3.  10 V                       

4.  102 V

Subtopic:  Electric Potential |
 71%
From NCERT
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The plates of a parallel plate capacitor have an area of 90 cm2 each and are separated by 2.5 mm. The capacitor is charged by a 400 volt supply. How much electrostatic energy is stored by the capacitor?

1.  2.55×10-6 J                         

2.  1.55×10-6 J

3.  8.15×10-6 J                         

4.  5.5×10-6 J

Subtopic:  Energy stored in Capacitor |
 71%
From NCERT
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An alpha particle with kinetic energy 10 MeV is heading towards a stationary nucleus of atomic number 50. Calculate the distance of closest approach.

1.  1.4×10-15 m                         

2.  4×10-15 m

3.  14.4×10-15 m                       

4.  8×10-15 m

Subtopic:  Electric Potential Energy |
 63%
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Calculate the area of the plates of a one farad parallel plate capacitor if the separation between plates is 1 mm and plates are in a vacuum.

1.  18×108 m2                 

2.  0.3×108 m2

3.  1.3×108 m2               

4.  1.13×108 m2

Subtopic:  Capacitance |
 68%
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A solid conducting sphere of radius a having a charge q is surrounded by a concentric conducting spherical shell of inner radius 2a and outer radius 3a as shown in figure.

                      

Find the amount of heat produced when switch is closed.

1. Kq2/2a                         

2. Kq2/3a

3. Kq2/4a                         

4. Kq2/6a

Subtopic:  Combination of Capacitors |
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A parallel plate capacitor of area ‘A’ , plate separation ‘d’ is filled with two dielectrics as shown. What is the capacitance of the arrangement ?

1.  30A4d                             

2. 40A3d

3. K+1ε0A2d                       

4.KK+3ε0A2K+1d

Subtopic:  Dielectrics in Capacitors |
 69%
From NCERT
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Assertion : A particle A of mass m and charge Q moves directly towards a fixed particle B, which

                  has charge Q. The speed of A is v when it is far away from B. The minimum separation

                  between the particles is proportional to Q2.

Reason : Total energy remains conserved.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Electric Potential Energy |
 71%
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Assertion : Potential difference between two points lying in a uniform electric field may be equal

                  to zero.

Reason : Points of line normal to electric field is equipotential line. 

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Equipotential Surfaces |
 75%
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Assertion :  At a distance r from a +ve charged particle potential is V and electric field strength is E.

                   Then graph between V2E is straight line.

Reason : For a point charge V2E=q4π0

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Relation between Field & Potential |
 73%
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