The magnetic field within a long, straight solenoid with a circular cross section and radius r is increasing at a rate of db/dt what is the rate of change of flux through a circle with radius r1 inside the solenoid, normal to the axis of the solenoid, and with center on the solenoid axis?
a) What is the rate of change of flux through a circle with radius r1 inside the solenoid, normal to the axis of the solenoid, and with center on the solenoid axis?
b) Find the magnitude of the induced electric field inside the solenoid, at a distance r1 from its axis.
c) What is the magnitude of the induced electric field outside the solenoid, at a distance r2 from the axis?
d) What is the magnitude of the induced emf in a circular turn of radius R/2 that has its center on the solenoid axis?
e) What is the magnitude of the induced emf if the radius in part d) is R?
f) What is the induced emf if the radius in part d is 2R?

What is hidden during a lunar eclipse? isn't the moon hidden?

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?