Neutral line Current 
Three phase
four wire supply R,Y, B & N is available. Identical Load L drawing 5Amps is
connected between each phase and neutral as in diagram. Ampere meters are connected
in three section of the neutral as shown. 
  | 
| Circuit Diagram | 
 Value of
current I1, I2 & I3 is to be estimated.
  
  ANSWER