The Electric Field

An object with a charge of -3.6 micro C and a mass of 0.012 kg experiences an upward electric force, due to a uniform electric field, equal in magnitude to its weight. (a) Find the direction and magnitude of the electric field. (b) If the electric charge on the object is doubled while its mass remains the same, find the directi ...continues

The Electric Field

Two point charges of equal magnitude are 8.0 cm apart. At the midpoint of the line connecting them, their combined electric field has a magnitude of 45 N/C. Find the magnitude of the charges.

The Electric Field

According to the figure it shows a system consisting of three charges, q1 = +5.00 micro C, q2 = +5.00 micro C, and q3 = -5.00 micro C, at the vertices of an equilateral triangle of side d = 2.75 cm. (a) Find the magnitude of the electric field at a point halfway between the charges q1 and q2. (b) Is the magnitude of the electr ...continues

Resistance and Ohm's Law

A bird lands on a bare copper wire carrying a current of 32 A. The wire is 8 gauge, which means that its cross-sectional area is 0.13 cm^2. (a) Find the difference in potential between the bird's feet, assuming they are separated by a distance of 6.0 cm. (b) Will your answer to part (a) increase or decrease if the separation ...continues

Resistance and Ohm's Law

A current of 0.76 A flows through a copper wire 0.44 mm in diameter when it is connected to a potential difference of 15 V. How long is the wire?

Flux Density

Here is what I know, Assume that the energy stored in the air gap is 1.5 J. What value of current is flowing in the coil? answer: 1.71A. If the total resistance of the coil and source is 47.5 ohms, the voltage of the source should be approximately. Answer: 81V Note: The cross section in the attachment is square). What ...continues

Flux Density

Here is what I know, Assume that the energy stored in the air gap is 1.5 J. What value of current is flowing in the coil? answer: 1.71A. If the total resistance of the coil and source is 47.5 ohms, the voltage of the source should be approximately. Answer: 81V Note: The cross section in the attachment is square). What ...continues

Optics and Waves Question

Question: Light from a torch held under water by a diver hits the surface at angle of incidence a) 40 degrees b) 55 degrees In each case calculate the path of the light. (Refractive index of water = 1.33) I would like the workings and answer to this problem..

Optics and Waves Question

Question: A 3cm focal length converging lens is used to look at a vernier scale 2.5cm from the lens. a) Where is the image? b) What is the magnification? Is it erect or inverted? c) What is the image height of a 1mm division on the scale? I would like the workings and answer to this problem!

Optics and Waves Question

Question: Radio waves of frequency 900 kHz are broadcast in step from two stations 15 kilometres apart. a) What is the wavelength of the signals? (c = 3 multiplied by 10`8 ms-1) b) What is the path difference between the two waves received at a point P 6 kilometres from one station along a line directly towards the oth ...continues