1. If the voltage across a 3.67E-3 H inductor is 2.14 V, at what rate is the current in it
changing?
2. A solenoid 0.16m long and with a cross section area of 7.82E-5 m^2 contains turns of
wire and carries a current of 7.5 A. What is the energy stored by the solenoid if the
inductance is 1.18E-8 H?
3. At the instant when the current in an inductor is increasing at a rate of 4.72E-2 A/s, the
magnitude of the voltage across the inductor is measured to be 2.80E-2 V. What is the
inductance of the inductor?
4. Indicate the direction of induced current in the circular loop of wire if the strength of the
magnetic field…
a. Increases
b. decreases
5. A thin 0.126m copper rod on the plane of the page moves with a constant velocity of
8.40m/s perpendicular to the rod in the direction shown in the figure. There is a uniform
magnetic field of 2.46E-2 T everywhere in space pointing into the page. The electric potential is
measured to be Va at end a and Vb at end b. What is the potential difference Vab( Va-Vb)?
6. In a certain region of space, the magnetic field has a value of 1.0E-2 T, and the electric field
has a value of 2.0E6 Vm^-1. What is the combined energy density of the electric and magnetic
fields?
7. Find the self-inductance of a 100-turns solenoid with cross-sectional area of 10cm^2 and a
length of 62.8 cm.
8. A solenoid with 100 turns has a length of 25 cm and loop’s radius of 10 cm. The current in it is
changing constantly from 30A to 0A in 0.02 s. What is the self induced emf of this solenoid?
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