Electricity and Magnetism Answers

Suppose the x − y plane is electrically charged with a constant charge density σ.
Find the electric field at a hight h from the x − y plane. Use Coulomb’s law.

Suppose we are leaving in a two dimensional world (i:e: there is no z direction/axis).
Assuming that Gauss’s law is valid in this world, find the electric field at a distance
r from for a point charge q. Is the answer same as what we studied in class?

A parallel plate capacitor is filled with insulating material of dielectric constant ε.
Calculate the capacitance.

Suppose the z axis is uniformly charged with a constant charge density λ. Calculate
the work done to bring a charge Q from a distance y = y2 to y = y1 along y axis.

A +200 uC charge is placed at the origin. A +400 uC charge is placed at 2m above the origin(y-axis), and a -600 uC charged is placed 3m to the right of the origin (x-axis). What is the magnitude and direction of the net force acting on the charge placed at the origin?

A 75.0 kW, 230-V shunt generator has a generated emf of 243.5 V. If the field current is 12.5 A at
rated output, what is the armature resistance? (Ans. 0.0399).

Briefly explain the theory and procedure for the experiment to determine Plank’s constant by
Photo electric apparatus. Also write down the concluding remarks.

The input voltage to a transformer is 24 V a.c. and the output voltage is 6.0 V. The input coil has 720 turns
How many turns are on the output coil?