Which of the following would not increase the emf produced by a generator? A. rotating the generator coil faster, B. increasing the strength of the generator magnets, C. increasing the number of turns of wire in the coil, D. reducing the cross-sectional area of the coil.

Which of the following statements is most correct? F. The north pole of a freely rotating magnet points north because the magnetic pole near the geographic North Pole is like the north pole of a magnet. G. The north pole of a freely rotating magnet points north because the magnetic pole near the geographic North Pole is like the south pole of a magnet. H. The north pole of a freely rotating magnet points south because the magnetic pole near the geographic South Pole is like the north pole of a magnet. J. The north pole of a freely rotating magnet points south because the magnetic pole near the geographic South Pole is like the south pole of a magnet.

Calculate the standard emf for each of the following reaction:

$$\mathrm{Hg}_2^{2+}(a q)+2 \mathrm{Cu}^{+}(a q) \longrightarrow 2 \mathrm{Hg}(l)+2 \mathrm{Cu}^{2+}(a q)$$

By what factor do you multiply the maximum emf to calculate the rms emf for an alternating current? F. 2, G. $\sqrt{2}$, H. $\frac{1}{\sqrt{2}}$, J. $\frac{1}{2}$.

The coil of a generator has a radius of 0.14 m. When this coil is unwound, the wire from which it is made has a length of 5.7 m. The magnetic field of the generator is 0.20 T, and the coil rotates at an angular speed of 25 rad/s. What is the peak emf of this generator?

A generator uses a coil that has 100 turns and a 0.50-T magnetic field. The frequency of this generator is 60.0 Hz, and its emf has an rms value of 120 V. Assuming that each turn of the coil is a square (an approximation), determine the length of the wire from which the coil is made.

In classical physics, the accuracy of measurements has always been limited by the measuring instruments used, and no instrument is perfect. How is this limitation different from that formulated by Heisenberg in the uncertainty principle?

How does Einstein’s theory that electromagnetic waves are quantized explain the fact that the frequency of light (rather than the intensity) determines whether electrons are ejected from a photosensitive surface?

A circular coil of wire has a radius of $7.5 \mathrm{~cm}$ and has $125$ turns of wire that carries $6.6 \mathrm{~A}$ of current. What is the magnetic field at the center of the coil?

Describe the conflict known as the ultraviolet catastrophe. How did Planck resolve this conflict? How does Planck’s assumption depart from classical physics?

(a) A bicycle generator rotates at 1875 rad/s, producing an 18.0 V peak emf. It has a 1.00 by 3.00 cm rectangular coil in a 0.640 T field. How many turns are in the coil? (b) Is this number of turns of wire practical for a 1.00 by 3.00 cm coil?

The rms voltage output of a generator is 220 V. The coil is a square of side 20.0 cm, has 300 turns of wire and rotates at 50 revolutions per second. What is the magnetic field?

What concepts did Maxwell use to help create his theory of electricity and magnetism? What phenomenon did Maxwell’s equations predict?

The rms current that a single coil of an electric guitar produces is 0.025 mA. The coil's resistance is $4.3 \mathrm{k} \Omega$. What is the maximum instantaneous current? What is therms emf produced by the coil? What is the maximum emf produced by the coil?