Electricity and Magnetism Answers

determine the electric potential energy of a group of four identical charges (5.0 x 10^-6 C each) from infinity and place them on the square,one to a corner, of side 0.500 meter.

64 equal drops of same size are charged at potential of 220 volt and colapsed to form a biger drop , calculate the potential of biger drop?

A long solenoid of radius 2 cm has 100 turns/cm and carries a current of 5A. A coil of radius 1 cm having 100 turns and a total resistance of 20 Ω is placed inside the solenoid coaxially. The coil is connected to a galvanometer. If the current in the solenoid is reversed in direction, find the charge flown through the galvanometer and how?

Consider a series RLC circuit where R = 447 Ω and C = 3.25 μF. However, the inductance L of the inductor is unknown. To find its value, you decide to perform some simple measurements. You apply an ac voltage that peaks at 84.0 V and observe, using an oscilloscope, that the resonance angular frequency occurs at 27500 s–1 (recall that ω = 2π f).
What is the inductance of the inductor in millihenrys?

You need to produce a solenoid that has an inductance of 3.67 μH . You construct the solenoid by uniformly winding 1.09 m of thin wire around a tube. How long, in centimeters, should the tube be?

A 105-turn circular coil of radius 2.31 cm is immersed in a uniform magnetic field that is perpendicular to the plane of the coil. During 0.185 s the magnetic field strength increases from 52.9 mT to 92.3 mT. Find the magnitude of the average EMF, in millivolts, that is induced in the coil during this time interval.

Answer should be in mV

A magnet is moved towards a conducting coil along its axis between two fixed positions (i) Quickly and (ii) Slowly, then the work done is and why?
(1) Larger in case (i)
(2) Larger in case (ii)
(3) Equal in both the cases.
(4) None

If a coil of area 10 cm2 and 10 turns with a magnetic field directed perpendicular to the plane and is changing at the rate of 10^8 gauss/second. The resistance of the coil is 20 ohms. The current in the coil will be? and how?

Each of two long parallel wires carries a constant current i along the same direction. The wires are separated by a distance 2l. The magnitude of resultant magnetic induction in the symmetric plane of this system located between the wires at a distance R from each wire will be? Find the relation between l and R if the magnetic induction in the symmetric plane of the system located between the wires is maximum.