Field Theory Answers

a student eat a dinner containing 3.0 x 106J of energy. He wishes to do an equivalent amount of work in a near by gym by lifting a 60kg object.How many times

 A uniform electric field exists in the region between two oppositely charged plane parallel plates. A proton is released from rest at the surface of the positively charged plate and strikes the surface of the opposite plate, 1.60 cm distant from the first, in a time interval of 3.20 x 10-6 s. 

(a) Find the magnitude of the electric field.

 (b) Find the speed of the proton when it strikes the negatively charged plate.

A point charge of +3.5 μC is placed 0.800 m to the left of the second, identical point charge.

What is the magnitudes and directions of forces that each charge exerts on the other?

Which of the following six functions represent a travelling wave pulse whose shape does not change with time?

1. 2e^-5(x-300t)2
2. (2t-5x)³
3. 9x²-42xt+49t²
4. x²-49t²
5. sqrt[(3t-5x)²+5]
6. (5+2x-3t)/(5+2x+3t)

1. Point charges q1 = −4.5 nC and q2 = +4.5 nC are separated by 3.1 mm, forming an electric

dipole. (a) Find the electric dipole moment (magnitude and direction). (b) The charges are in a

uniform electric field whose direction makes an angle of 36.9 ̊ with the line connecting the charges.

What is the magnitude of this field if the torque exerted on the dipole has a magnitude 7.2 × 10−9N ∙

m?

An electron experiences a force f given as (f=3.2i ---2.7j)×10^-13N when passing through a magnetic field B=0.72kJ. calculate the velocity of the electron?. Take the electron charge Q=1.5×10^-19cou.

Prove that electric field and electric potential are connected by the formula E=V/r

The earth is 4times the size of the moon and acceleration due to gravity of the earth is 80times that of the moon. Calculate the ratio of the mass of the moon to that of the earth.

Two parallel plates at a distance of 0.008m apart are maintained at a potential difference of 600v with the negative plate earthed, calculate the electric field strength around the plates.

Lucy and her bike together have a mass of 120 kg she slows down from 4.5m/s to 3.5 m/s how much kinetic energy does she lose