Part a   
 
 at A the reading is 11.5 mA   
 
 at B the reading is 27 mA   
 
 at C the reading is 43.5 mA   
 
 Part b   
 
 at A the reading is 23 mA   
 
 at B the reading is 54 mA   
 
 at C the reading is 87 mA