2. A generator consists of a 87-turn coil rotating in a uniform magnetic field of 1.35 T. The generator produces an output V=25-sin(812-t), where V is in Volts and t is in seconds. What is the area of the rotating coil? A. 1.24 cm² B. 2.62 cm² C. 3.87 cm² D. 5.44 cm² E. 6.91 cm²

The diagram below shows two, thin, infinitely-long, parallel conducting wires that are separated by a perpendicular distance of 2.0 cm. What is the coordinate on the y-axis where the total magnetic field is zero?     a. y = 4.8 cm   b. y = 5.6 cm   c. y = 4.4 cm   d. y = 6.6 cm   e. y = 5.2 cm

Force on a Wire: The magnetic force on a current-carrying wire in a magnetic field is the strongest when Group of answer choices A. the current is at a 180° angle with respect to the magnetic field lines. B. the current is perpendicular to the magnetic field lines. C. the current is in the direction opposite to the magnetic field lines. D. the current is at a 0° angle with respect to the magnetic field lines. E. the current is in the direction of the magnetic field lines.

1.  A DC power line for a light-rail system carries 950 A at an angle of 33° to the Earth’s 5.00 × 10-5 T magnetic field. What is the magnitude of the force (in N) on a 125 m section of this line?  2. Consider a 150 turn square loop of wire 15.5 cm on a side that carries a 56 A current in a 1.6 T field. What is the maximum torque on the loop of wire in N⋅m?  What is the magnitude of the torque in N⋅m when the angle between the field and the normal to the plane of the loop θ is 14°?  3.  Consider two two long, straight, parallel, current-carrying wires, separated by a distance d = 4.5 cm, as shown in the figure. The left wire is directed out of the page with current I1, and the right wire is directed into the page with current I2. The point P is a distance d from both wires, so the wires and the point form an equilateral triangle. If both wires are carrying a current of 3.5 A, what is the magnitude of the magnetic field, in teslas, at point P?  If the current from the left wire is 3.5 A…

A cylindrical solenoid that is 40-cm long generates a uniform magnetic field of strength 1.4 T inside the solenoid when the current is 7.0 A. How many turns of a single coil are present in this solenoid?    a. 40,000 turns   b. 64,000 turns   c. 56,000 turns   d. 48,000 turns   e. 32,000 turns

7. A very long thin wire produces a magnetic field of 0.002 x 10-4 T at a distance of 1.0 mm from the wire. What is the magnitude of the current? = 4 x 10-7 T.m/A) (Mo a) 1.0 mA b) 2.0 mA c) 4000 mA d) 3100 mA 8. An ideal solenoid having 200 turns and carrying a current of 2.0 A is 25 cm long. What is the magnitude of the magnetic field at the center of the solenoid? (но = 4 x 10-7 T.m/A)

CQ 10. Many roller coasters use magnetic brakes to slow the train at the end of its run. A conducting plate on the train passes by powerful magnets fixed on the track. a. Explain the principle behind this magnetic braking. b. The system needs an ordinary friction-based brake to bring the train to a full stop. Explain why the magnetic brake is not very efficient when the train is moving slowly

Q. What are the values of (a) L and 5. The secondary coil of a step-up transformer provides the voltage that operates an electrostatic air filter. The turns ratio of the transformer is 50:1. The primary coil is plugged into a standard 120-V outlet. The current in the secondary coil is 1.7 x 103 A. Find the power consumed by the air filter. 6. The earth's magnetic field, like any magnetic field, stores energy. The maximum strength of the