A solenoid of cross sectional area 1.4 m2 and 2.0 m long carries a current of 4.0 A.It stores an energy of 3.4 J.How many turns per unit length are in this solenoid?
A) 390 turns/m
B) 300 turns/m
C) 450 turns/m
D) 420 turns/m
E) 350 turns/m
Correct Answer:
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