Electricity and Magnetism Answers

Find the intensity of an electric field at a distance of 2× 10^-8 cm from a monovalent ion.The ion is point - charged.

When a copper wire with a cross section of 1.5mm^2 was tensioned , permanent set was observed to begin at a force of 4.5N.What is the elastic limit of the wire material?

7. Up to what distance can two electrons approach each other if they are moving toward each other with a relative velocity of 10^{^}8 sm/s?

6. Two circular coil turns are so arranged in two mutually perpendicular planes that the centres of the turns coincide. The radius of each coil is 2 sm and the currents flowing through the turns I1= I2 =5 A. Find the intensity of the magnetic field at the centre of these turns.

1. Having covered the path from one plate to the other in a plane capacitor, an electron acquires a velocity of 108 cm/s. The distance between the plates is 5.3 mm. Find the difference of potentials between the plates.

An infinitely long conductor has a circular loop tangent to it. A current of 5 A flows through the conductor. Find the radius of the loop if the intensity of the magnetic field at its centre is 41 A/m.

One-meter-long coaxial cable is incorrectly connected to the output device, so part of the signal bounces back on the connection. Determines the speed of the signal along the wire if we see echoes in the signal with a delay of 10 ns. Determines the wavelength of the signal in the cable if its frequency is 10 GHz.

9.2.Two point charges in air at a distance of 20 cm from each other

interact with a certain force. At what distance from each other should

these charges be placed in oil to'obtain the same force of interaction?

9.1.Find the force of attraction betweenthenucleus of a hydrogen

atom and an electron. The radius of the hydrogen atom isO.5x10-8cm

and the charge of the nucleus is equal in magnitude and opposite in

sign to that of the electron.

The max magnetic field strength of an electromagnetic field is 5 x 10^-6 T. Calculate the maximum electric field strength if the wave is traveling in a medium in which the speed of the wave is 0.75c