An electricity and magnetism problem by Asutosh Choudhury
Electricity and Magnetism
Level
3
if E- electric field,V-electric potential then, at a point
1. if E=0,V must be 0
2. if V=0, E must be 0
3. if E not 0,V can not be 0
4. if V not 0,V can not be0
both 3,4
both 1,2
none
both 2,3
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There is no general relationship between the value of V and the value of E. Instead, the magnitude of E is equal to the rate at which V decreases over a short distance. Consider, the point midway between two positive charges. E is 0 there, but V is high. Or, consider the point midway between two negative charges. E is also 0 there, but V is low, because it is negative. Finally, consider the point midway between positive and negative charges of equal magnitude. There E is not 0, because it points towards the negative charge, but V is zero.