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Electricity and Magnetism
The human ear can hear sounds at frequencies from 20 Hz- 20,000 Hz. What are the wavelength equivalent to the lowest frequency a human can hear? What will the size of the organ pipe that will play in it is wavelength? The pipeline is 1/2 of the wavelength.
Electricity and Magnetism
two permanent magnets are put onto a mass scale with unlike poles facing each other. a wire of length 40cm is put between the current of 0.653A is applied. magnetic flux density is 0.02T and the force produced is upwards. what mass would the scale read if it was set to zero before the current turned on
Electricity and Magnetism
How to heat up a piece of metal to certain degrees that is located at the center of magnetic field , thanks
Electricity and Magnetism
Number of winds Magnetic Field (mT)
0=-0.000109173,
3=0.105413911,
6=0.280796205,
9=0.491070432,
12=0.638107704,
15=0.799167543,
18=0.799167543,
21=1.166024878.
1. What is the relationship between the number of winds and magnetic field strength?
2. According to your graph, what would the magnetic field strength reading be for 10 winds? For 30 winds? Explain.
3. Write a discussion and conclusion about this experiment. Summarise the results. Include some thoughts on the underlying physics involved and sources of errors that may have been observed.
Electricity and Magnetism
(a) Twelve equal charges, q, are situated at the corners of a regular 12–sided polygon (for instance, one on each numeral of a clock face). What is the net force on a test charge Q at the center? (b) Suppose one of the 12 q’s is removed (the one at “6 o’clock”). What is the force on Q? Explain your reasoning carefully (c) Now 13 equalcharges, q,areplacedatthecornersofaregular 13–sidedpolygon. Whatisthe force on a test charge Q at the center? (d) If one of the 13 q’s is removed, what is the force on Q? Explain your reasoning.
Electricity and Magnetism
In an experiment, the tiny droplets of the negatively electrified oil are dropping through a vacuum. Magnitude of the electric field is 5.92×104 NC−1. Direction of the electric field is assumed to be downward. (a)Anexperimenterobservesaoneparticulardropletandthatdropletremainssuspendedagainst gravity. Assume the mass of the droplet to be 2.93×10−15 kg. What is the charge carried by the droplet? (b) Now another droplet of same mass falls, in the vacuum, from rest to 15.3cm in 0.275s. What is the charge on the droplet in this case?
Electricity and Magnetism
A television loop antenna has a diameter of 2.1m. The magnetic field of a TV signal is normal to the plane loop and, its magnitude is 0.42 T. Calculate the magnetic flux produced.
Electricity and Magnetism
an electric field of magnitude 3.50 kn c is applied along the x-axis. calculate the electric flux through a rectangular plane 0.35m wide and 0.7m long a)if the plane is ||le to the yz plane b)if the plane is ||le to the XY plane and c)if the plane contain the y-axis and its normal make an angle of 40.8 degrees with the x-axis
Electricity and Magnetism
5. A negative charge of magnitude q is placed at the origin. Two positive charges of magnitude
q are placed along the horizontal axis at L and −L.
(i) What is the net electrical force on the negative charge?
q are placed along the horizontal axis at L and −L.
(i) What is the net electrical force on the negative charge?
Electricity and Magnetism
Each cubic meter of the wire contains approximately 8.5x10^28 free electrons. The diameter of the wire is 2.5 mm and the length of wire within the magnetic field is 0.15 m. Deduce the speed of the electrons in the wire when the current is 0.20 A.
