Question 1
What current in a solenoid 15.0-cm long wound with 100 turns would produce a magnetic field equal to that of the Earth, 5.00 × 10−5 T?
Question 2
A 0.50-m long solenoid consists of 1 000 turns of copper wire wound with a 4.0 cm radius. When the current in the solenoid is 18 A, the magnetic field at a point 1.0 cm from the central axis of the solenoid is
◦
0.090 mT.
◦
0.36 mT.
◦
23 mT.
◦
36 mT.
◦
45 mT.