Two long solenoids A and B are wound with the same type of wire

PHYSICS · Single correct · AP · Physics C: Electricity and Magnetism · Magnetic Fields and Electromagnetism · Magnetic Fields and Electromagnetism

Problem

Two long solenoids A and B are wound with the same type of wire. Solenoid A has

600

turns, length

0.30\,\text{m}

and carries a current of

2.5\,\text{A}

. Solenoid B has

750

turns and length

0.50\,\text{m}

. What current must pass through solenoid B so that it produces the same magnetic field as solenoid A? (a)

2.0\,\text{A}

(b)

3.3\,\text{A}

(c)

4.2\,\text{A}

(d)

1.9\,\text{A}