Medical devices implanted inside the body are often powered using transcutaneous energy transfer (tet), a type of wireless charging using a pair of closely spaced coils. an emf is generated around a coil inside the body by varying the current through a nearby coil outside the body, producing a changing magnetic flux. calculate the average induced emf (in v) if each 15.0-turn coil has a radius of 1.80 cm and the current in the external coil varies from its maximum value of 11.5 a to zero in 6.75 ✕ 10−6 s. (hint: recall from topic 19 that the magnetic field at the center of the current-carrying external coil is

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.

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy. work depends on the square of the change in potential energy. work is equal to the negative of the change in kinetic energy. work is equal to the square of the change in kinetic energy

Which describes increasing the efficiency of energy resource