Two solenoids P and Q are wound with copper wire

PHYSICS · Subjective · AP · Physics 2: Algebra-based · Magnetism and Electromagnetism · Magnetism and Electromagnetism

Problem

Two solenoids P and Q are wound with copper wire. Solenoid P has 600 turns uniformly distributed over a length of

0.30\,\text{m}

and carries a current of

3\,\text{A}

. Solenoid Q has 900 turns and carries a current of

4\,\text{A}

. If the magnetic field inside both solenoids is the same, calculate the length of solenoid Q.