A solenoid of length 0.50 m has 1,000 tightly wound turns and carries a current of 2.0 A. What is the magnetic field strength inside the core? ()
Answer and explanation
Correct answer: B.
- Step 1: Turns per unit length: .
- Step 2: Solenoid magnetic field formula: .
- Step 3: Calculate: .
Answer
5.03 x 10^-3 T.
Why not the others: '' forgets factor of 2 in current; '' uses .
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