Electricity and Magnetism Answers

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?

a 2.0H solenoid is connected in serries with a resistor of total reisitance 5.0 ohms to 2.0V dc supply calculate 1. the final current 2.the initial rate of change of current with time 3. the rate of change of current with time when current is 2A

Can a charged particle q move through a uniform magnetic field B without experiencing any force F ? Explain.

a solenoid having an air core and 10 cm long has 100 turns and its area of cross-section is 5 cm² . find co-efficient of self-inductance of the solenoid?

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a spherical shell of charge of uniform density . Plot E for distance r from the center of the shell ranging from zero to 30 cm. Assume that  = 1.010-6 C/m3, a = 10 cm and b = 20 cm.

3-11. At some instant the velocity components of an electron moving between two charged parallel

plates are vx = 1.5105 m/s and vy = 0.30104 m/s. If the electric field between the plates is given by

E = j1.2104 N/C, (a) what is the acceleration of the electron? (b) When the x-coordinate of the

electron has changed by 2.0 cm what will be the velocity of the electron?

Warner likes waffles for breakfast. How much energy is used by a waffle maker that has a power rating of .7501 kW and is operated for 3.6h ?

A plane has an air speed of 240km/h.what should be the planes heading if it is to travel due north,relative to the earth in a wind blowing with a velocity of 100km/h in an easterly direction?