A multilayer coil of 2000 turns of fine wire is 20 mm long and has a thickness 5 mm of winding. If the coil carries a current of 5 mA, the mmf generated is (a) 10 A . t (c) 2000 A .t (b) 500 A . t (d) None of the above Answers
Gives
n=2000 turn
"i=5mA"
Magnetomotive force "(F)=ni(A.t)"
Magnetomotive force=turn"\\times" area
"F=2000\\times5\\times10^{-3}A .t"
"F=10A.t"
Option (a) is correct
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