Problem 75-1    Source:   Problem 1 - page 1076 - KNIGHT, Randall D. -    Book: Physics - A Strategic Approach - 2ª Edição - Ed. Bookman - 2009.

The intensity of the Earth's magnetic induction field is 5 x 10^-5T. At what speed should you drive your car in order to create a fem of 1.0 volt motion along your radio antenna that is 1 meter long? Suppose the movement of the antenna is perpendicular to B.

Problem 75-2    Source:   Problem 3 - page 1076 - KNIGHT, Randall D. -    Book: Physics - A Strategic Approach - 2ª Edição - Ed. Bookman - 2009.

A 10 cm long wire is pulled along a conductive U-shaped rail in the presence of a perpendicular magnetic field. The total resistance of the wire and the rail is 0.20 Ω. Pulling the wire with a force of 1.0 N causes 4 W of power to dissipate in the circuit.

a) What is the speed of the wire when pulled with a force of 1.0 N?

b) What is the intensity of the magnetic induction field?

Problem 75-3    Source:   Problem 32-2 - HALIDAY & RESNICK -    Book: Fundamentals of Physics - 8ª Edition - Ed. LTC - 2009.

A current I = I_o sin (ωt) passes through a large solenoid that has N turns per unit in length. A circular loop of area A is inside the solenoid and its axis coincides with the axis of the solenoid.

a) What is the electromotive force induced in the loop?

b) Determine the phase angle between the induced voltage and the electric current.

Problem 75-4    Source:   Problem 30-7 - HALIDAY & RESNICK -    Book: Fundamentos de Física - Vol. 3 - 9ª Edição - Ed. LTC - 2010.

In Figure 75-04.a, the magnetic field flux in the loop increases according to the equation Φ = 6 t² + 7 t, where Φ is in milliwebers and t in seconds. Determine:

a) the magnitude of the electromotive force induced in the loop at the instant t = 2 s;

b) the direction of the current in the resistor R.

Problem 75-5    Source:   Example 34-1 - RANDALL -    Book: Fundamentos de Física - 8ª Edição - Ed. LTC - 2009.

It is known that the Earth's magnetic field in northern Canada points straight down. The crew of a Boeing 747, flying at 260 m/s over this region of Canada, discovers that there is a potential difference of 0.95 V between the tips of the wings of your plane. The wingspan of a Boeing 747 is 65 m.

a) What is the strength of the magnetic field at the location?

Problem 75-6    Source:   Problem created by the author of the site.

AFigure 75-06.a shows a bar that can slide on two rails. There is no friction. There is a magnetic field of intensity 1.40 T directed away from the page. The resistor is R = 4 Ω. Suppose that L = 2.0 m. Determine:

a) the force F_pull to move the bar to the right with a constant speed equal to 4.0 m/s;

b) what is the power dissipated in the resistor R.

Problem 75-7    Source:   Problema 10 - page 1077 - KNIGHT, Randall D. -    Book: Física - Uma Abordagem Estratégica - 2ª Edição - Ed. Bookman - 2009.

The metallic equilateral triangle in Figure 75-07.a has sides of 20 cm and lies with its half inside the magnetic field of 0.10 T.

a) What is the magnetic flux through the triangle?

b) If the intensity of the magnetic field decreases, what will be the direction of the induced current in the triangle??

Problem 75-8    Source:   Problem 14 - page 1077 - KNIGHT, Randall D. -    Book: Física - Uma Abordagem Estratégica - 2ª Edição - Ed. Bookman - 2009.

The resistance of the square section loop in Figure 75-08.a is 0.20 Ω. Under the conditions shown in the figure, answer:

a) Magnetic field strength is increasing or decreasing?

b) At what rate (T/s)?