45. A solenoid is wound with 200 turns/cm. An outer layer of insulated wire with 180...

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45. •• A solenoid is wound with 200 turns/cm. An outer layer of insulated wire with 180 turns/cm is wound over the first layer of wire. When the solenoid is operating, the inner coil carries a current of 10 A and the outer carries 15 A in the direction opposite to that in the inner coil (▼ Figure 19.34).

(a) What is the direction of the field at the center for this configuration?

(b) What is the magnitude of the field at the center of this arrangement?

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