ElectrostaticsElectric Potential (NEET (NTANational Eligibility cum Medical Entrance Test) Physics): Questions 20  23 of 25
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Question number: 20
» Electrostatics » Electric Potential
Question
Identical point charges, each having +q charge, are fixed at each of the points x = x _{0}, x = 3x _{0}, x = 5x _{0} ……… infinite, on the xaxis and an identical point charges, each having q charge, are fixed at each of the points x = 2x _{0}, x = 4x _{0}, x = 6x _{0} ……. infinite. Here x _{0} is a positive constant. Potential at the origin due to the above system of charges is,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d.  0 

Question number: 21
» Electrostatics » Electric Potential
Question
How much kinetic energy will be gained by an α particle in going from a point at 70V to another point at 50V?
Choices
Choice (4)  Response  

a.  40 MeV 

b.  40 keV 

c.  40 eV 

d.  0 eV 

Question number: 22
» Electrostatics » Electric Potential
Assertion (Ꭺ)
A bird perches on a high power line and nothing happens to the bird.
Reason (Ꭱ)
The level of bird is very high from the ground.
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ 

b.  Both Ꭺ and Ꭱ are false 

c.  Ꭺ is true but Ꭱ is false 

d.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

Question number: 23
» Electrostatics » Electric Potential
Question
A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then electric field at Q is proportional to
Choices
Choice (4)  Response  

a.  p ^{1 } and r ^{2} 

b.  p and r ^{2} 

c.  p and r ^{3} 

d.  P ^{2} and r ^{3} 
