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13. A conducting ring has a radius r=4.0 cm. The B-field is at an angle 30∘ to A. a) Make a sketch. b) For Voltage (Emf=8.0 V), calculate the change in the B-field (dB/dt= ?) c) Calculate the current if the resistance in the wire is R=12.0ohms.
14. Using the circuit shown: a) Calculate the total resistance. b) Calculate the current through the 4.0ohm resistor. c) Calculate the voltage dropped over the 8.0ohm resistor. d) A 3.0ohm resistor is placed in series with the 4.0ohm resistor. Find the current now in the 4.0ohm resistor.
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