A66-mh solenoid inductor is wound on a form 0.80 m in length and 0.10 m in diameter. a coil is tightly wound around the solenoid at its center. the coil resistance is 7.7 ohms. the mutual inductance of the coil and solenoid is 34 µh. at a given instant, the current in the solenoid is 810 ma, and is decreasing at the rate of 2.5 a/s.

a) the number of turns in the winding of the solenoid is?
b) at the given instant, the induced emf in the solenoid is?
c) at the given instant, the magnetic energy of the solenoid, in

Use the right-hand rule for magnetic force to determine the charge on the moving particle. this is a charge.

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.

Along wire carrying a 4.2 a current perpendicular to the xy-plane intersects the x-axis at x=−1.7cm. a second, parallel wire carrying a 3.0 a current intersects the x-axis at x=+1.7cm. part a at what point on the x-axis is the magnetic field zero if the two currents are in the same direction? express your answer to two significant figures and include the appropriate units.