3- In class, we introduced the vector potential Ä to write the magnetic field B as B = V × Ã. We showed that we could always choose Ä to satisfy V · Ã = 0. Using Ampére's law, we then found %3D j(F") dr' ÃF) = Но %3D 4т for a localized (volume) current density. a) Verify that this vector potential Ã(7) indeed satisfies ỹ ·Ã = 0. b) Verify that the magnetic field B is consistent with Biot-Savart's law. c) Finally, verify also that Ampére's law follows automatically from this vector potential Ā(7).

should i just plug in numbers

A lamp requires a current of 0.96 amps when connected to a circuit with a voltage of 120 volts. Find the resistance in ohms of the lamp. Carry the answer to two decimal places.

Dominic leaves a lamp on that uses 3 40W light bulbs. If it stayed on ALL DAY for the entire month of September, how much would the light increase the next power bill if electricity costs $0.141 per kWh.