A long solenoid has 500 turns per cm and carries a current I. The magn – McqOptions

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1.	A long solenoid has 500 turns per cm and carries a current I. The magnetic field at its center is 7.54 10-2 Wb m-2. Another long solenoid has 300 turns per cm and it carries a current ( frac {I}{3} ). What is the value of magnetic field at the center?
A.	1.50 10<sup>-3</sup> Wb/m<sup>2</sup>
B.	1.50 10<sup>-5</sup> Wb/m<sup>2</sup>
C.	1.05 10<sup>-3</sup> Wb/m<sup>2</sup>
D.	1.50 10<sup>-2</sup> Wb/m<sup>2</sup>
Answer» E.

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