State and explain Faraday's law of induction
What will be an ideal response?
Answer: Faraday's law states that voltage induced in a coil is proportional to the rate at which the magnetic field strength through the coil changes. It is also proportional to the number of turns on the coil. This change can be brought about by moving the coil, changing its shape, or changing the magnetic field strength. Because of Faraday's law, the production of current need not be restricted to batteries, but can be induced in a wire by any of the changes stated. Faraday's law underlies generators and has changed the electrical and industrial world.
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If the average wind speed for 24 hours is 15 mph at one site, but 10 mph for 12 hours and then 20 mph for 12 hours at another site, how much output can be expected from the same turbine situated at the first site compared to the second site?
a. three-quarters b. half c. one quarter d. one eighth e. same, since the average wind speeds are the same
Ohm's Law: The figure shows electrons passing through a resistor. The arrow shows the direction in which the electrons are moving. Which of the following statements are correct? (There could be more than one correct choice.)
A. The electrons are moving slower at point b than at point a. B. The electric potential is higher at point b than at point a. C. The electric potential is lower at point b than at point a. D. The electrons are losing electric potential energy as they move through the resistor from a to b. E. The speed of the electrons at point b is the same as it is at point a.
Two long parallel wires each carry a current of 5.0 A directed to the east. The two wires are separated by 8.0 cm. What is the magnitude of the magnetic field at a point that is 5.0 cm from each of the wires?
a. 72 ?T b. 48 ?T c. 24 ?T d. 96 ?T e. 32 ?T
The sun appears larger at sunset than it does when overhead because of:
1.Scattering of light. 2.Dispersion. 3.Diffraction. 4.Refraction. 5.An optical illusion. 6.None of the above.