Question

A solenoid that is 142 cm long has a radius of 2.52 cm and a winding...

  1. A solenoid that is 142 cm long has a radius of 2.52 cm and a winding of 1220 turns. How much current is required to achieve a magnetic field of 4.50 mT inside the solenoid?

A. 2.03 A

B. 1.70 A

C. 1.15 A

D. 6.88 A

E. 4.17 A

2. The figure shows that the solenoid’s current flows out of the page at the top and into the page at the bottom of each turn. If the solenoid’s current is being stopped, what is the direction of the induced magnetic field inside the coil? Explain briefly.
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