Electricity and Magnetism Answers

The human hair is comb using a rubber comb. What charge acquired by the hair and by the comb?

which physical phenomenon is used by both the electric motor and the generator?

A rectangular current-carrying wire loop which is free to rotate about a vertical axis in a uniform magnetic field of 1.42 T is rotating anti-clockwise. The current in the loop is 250 mA. The distance between a to b is 20 cm.

Determine the magnetic force exerted on a-b.

An electron is accelerated through a 100 V potential difference before perpendicularly entering a uniform magnetic field. Inside the field, the electron moves in circular trajectory of radius 4 cm, calculate the magnetic force that acts on the electron.

Two long parallel wires, P and Q are fixed on a horizontal plane in north-south direction. Wire P is 10 cm left of Q. Wire P carries 40 A current northwards while wire Q carries 20 A current downwards. Determine the magnitude and direction of the resultant magnetic field at midpoint between the wires.

A conducting cylinder of radius 3.25 cm and length 5.6 cm has a total charge of 4.5 x 10^-9 C distributed uniformly on its surface area. Find the potential at a) its surface, and b) 2.5 cm and c) 5.0 cm from the center of the cylinder.

A point charge 𝑞1 = +6.00 𝑥 10−9𝐶 is at the point 𝑥 = 0.800 𝑚, 𝑦 = 0.600 𝑚 and a second point charge 𝑞2 = −2.00 𝑥 10−9𝐶 is at the point 𝑥 = 0.800 𝑚, 𝑦 = 0 𝑚. Calculate the magnitude and direction of the resultant electric field at the origin due to these charges.

A point charge 𝑞 = 8.00 𝑥 10−9𝐶 is at the center of the cube with sides of length 0.200 m. What is the electric flux through one of the six faces of the cube?

The angle of the reflected light n=2.42 whose perfectle polarized? Find the reflectance of TE and TM of that angle

A 50 cm horizontal straight wire is place in a uniform magnetic field of magnetic field strength 0.5 T which is directed into the page Determine the magnitude and direction of the current to enable the wire remain float in equilibrium. Given the mass of the wire is 2 g.