Anonconducting sphere contains positive charge distributed uniformly throughout its volume. which statements about the potential due to this sphere are true? all potentials are measured relative to infinity. (there may be more than one correct (a) the potential is highest at the center of the sphere. (b) the potential at the center of the sphere is the same as the potential at the surface. (c) the potential at the surface is higher than the potential at the center. (d) the potential at the center is the same as the potential at infinity. (e) the potential at the center of the sphere is zero.

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time ∆t. the resistance of the coil is r, and the total charge is q = i∆t, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly “swiped” past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be “swiped” through the reader at exactly the right speed? why or why not?

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot