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1. A current of 7.19 A in a long, straight wire produces a magnetic field of...

1. A current of 7.19 A in a long, straight wire produces a magnetic field of 4.87 μT at a certain distance from the wire. Find this distance.

2. What is the rms current flowing through a light bulb that uses an average power of 30.0 W when it is plugged into a wall receptacle supplying an rms voltage of 240.0 V?

3. The 400-turn primary coil of a step‑down transformer is connected to an AC line that is 120.0 V (rms). The secondary coil is to supply 15.0 A (rms) at 6.60 V (rms).

Assuming no power loss in the transformer, what is the number of turns ?s in the secondary coil?

?s=

What is the rms current ?p,rms in the primary coil?

?p,rms=

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