MCQ`s help ~~ Physics question..?

Posted on 2016-03-11 18:28:00 in Physics by AMIT

For each of the following arrangements of two point charges, find all the points along the line passing through both charges for which the electric potential V is zero (take V = 0 infinitely far from the charges) and for which the electric field E is zero. 

Part A 
Charges +Q and +2Q separated by a distance d. 

A) V=0 at infinity 
B) V=0 at infinity and at the midpoint between the charges 
C) V=0 nowhere 

Part B 
Charges +Q and +2Q separated by a distance d. 

A) E=0 at the infinity 
B) E=0 at the midpoint between charges 
C) E=0 at the point which is between charges at the distance d/(1+2√) from +Q charge 

Part C 
Charges −Q and +2Q separated by a distance d. 

A) V=0 at infinity 

B) V=0 at infinity, at the point between charges at the distance d/3 from −Q charge, and at the point which is at the distance d from −Q and 2d from 2Q 

C) V=0 at infinity, at the point between charges at the distance 2d/3 from −Q charge, and at the point which is at the distance d from 2Q and 2d from −Q 

Part D 
Charges −Q and +2Q separated by a distance d. 

A) E=0 at the infinity 

B) E=0 at the point between charges and at the distance d/3 from −Q charge 

C) E=0 at the point which is at the distance d/(2√−1) from −Q and d+d/(2√−1) from 2Q charge 

Part E 
Are both V and E zero at the same places? 

A) Yes 
B) No

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