Exercise 1

How many turns of wire would be required to make a140-mHinductor out of a33.0-cm-longair-filled solenoid with a diameter of5.3cm?( use two significant figures)

Exercise 2 ( express answer in two significant figures)

Neon signs require12kVfor their operation

1-To operate from a250-Vline, what must be the ratio of secondary to primary turns of the transformer? Assume 100% efficiency

2-What would the voltage output be if the transformer were connected in reverse?

Exercise 3 ( answer in two significant figures)

It takes 2.70msfor the current in anLRcircuit to increase from zero to 0.72 its maximum value.

1-Determine the time constant of the circuit.

2-Determine the resistance of the circuit if 35.0mH.

Exercise 4 ( answer in three significant figures)

A transformer has 350 primary turns and 1140 secondary turns. The input voltage is120?Vand the output current is17.0A.Assume100%efficiency.

1-What is the output voltage?

2-What is the input current?

Exercise 5

The magnetic field inside an air-filled solenoid30cmlong and2.1cmin diameter is0.79TApproximately how much energy is stored in this field?

Exercise 6

If the current in a 190mHcoil changes steadily from 29.0Ato16.0Ain430ms,what is the magnitude of the induced emf? (Answer in three significant figures)

Exercise 7 (answer in two significant figures)

The variable capacitor in the tuner of an AM radio has a capacitance of2900pFwhen the radio is tuned to a station at550kHz.

1-What must be the capacitance for a station at1400kHz?

2-What is the inductance (assumed constant)?

Exercise 8

The generator of a car idling at1400rpmproduces16.3V.What will the output be at a rotation speed of2500rpm,assuming nothing else changes? ( answer in three significant figures)

Exercise 9

The rod moves with a speed of1.2m/son rails32.0cmapart. The rod has a resistance of2.6?.The magnetic field is0.32T,and the resistance of theU-shaped conductor is27.0?at a given instant.