Electrostatics (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 77  80 of 109
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Question number: 77
» Electrostatics » Electrostatic Potential Energy
Question
Four charges + q, q, + q and q are put together on four corners of a square as shown in figure. The net electrostatic energy of the system is,
Choices
Choice (4)  Response  

a.  Zero 

b. 


c. 


d.  All of the above 

Question number: 78
» Electrostatics » Electric Field Due to a Point Charge
Question
Electric field at point P is given as
Choices
Choice (4)  Response  

a.  r ^{3} 

b.  r ^{1} 

c.  r ^{4} 

d.  r ^{2} 

Question number: 79
» Electrostatics » Capacitors
Assertion (Ꭺ)
If the distance between parallel plates of a capacitor is halved and dielectric constant is made three times, then the capacitance becomes 6 times.
Reason (Ꭱ)
Capacity of the capacitor does not depend upon the nature of the material of plates.
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 false but Ꭱ is true 

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

Question number: 80
» 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 
