Electricity and Magnetism Answers

Determine the effective capacitance of the following combination of capacitors given
that the capacitance of each capacitor is 3 μF.

Two identical pulses each of magnitude 12 V and width 2 us are incident at t = 0 on a lossless transmission line of length 400 m terminated with a load. If the two pulses are separated 3 µs (similar to the case of Figure 11.53) and u = 2 X 108 m/s, when does the contribution to VL(€, i) by the second pulse start overlapping that of the first?

What must you have for an electromagnet to work that you don’t need for a regular magnet?

What is the value of magnetic dip at a place where BH= 0?

The length of a 500 turn solenoid is 3 cm . Calculate the magnitude at the center of magnetic field of the solenoid when it carries a 0.6 A current.

Calculate the electric field associated with a LASER beam having energy density 10^6 J/cm^2

In a certain medium, E = 10 cos (108t — 3y) ax V/m. What type of medium is it?

the earth receives about 1300 watt/m2 radiant energy from the sun. Assuming the energy to be in the form of plane polarised monochromatic waves and assuming normal incidence calculate the magnitude of electric field vector in the sun light.

Two metallic balls with radiuses r = 4 cm and a bigger one with R = 8 cm are positioned at big distance from each other and all connected with a thin wire. One of the smaller balls initially was charged up to Q = 12 nCl. Two others are surrounded by metallic envelopes with radiuses r = 5 cm and R = 9 cm correspondingly. Envelopes are electrically grounded. Find the charge of the first ball after the charge equilibrium will be reached. Please, express result is nCl and write it down rounded up to 3 significant digits.

What is the electric field at a distance of 3cm from 4mC of negative charge?
The electric potential energy of an object at point A is known to be 50 J. If it is released from rest at A, it gains 30 J of kinetic energy as it moves to point B. What is its potential energy at B?
How much work does a 12-V battery do in pushing 2mC of charge through a circuit containing one light bulb?
What was your electric potential relative to a metal pipe if a spark jumped 1.3 cm (0.5 in.) through dry air from your finger to the pipe?