a) Imagine an electron launched in the plane of your exam sheet. There is a magn

Question

a) Imagine an electron launched in the plane of your exam sheet. There is a magnetic field perpendicular to it and pointing out of the page. Will the electron revolve clockwise or counterclockwise?
b) What can you say about the electric field and the electric potential inside a conductor at equilibrium? Justify your answers.
c) Explain why the electric field line and the equipotential passing through a given point are perpendicular.
d) Do parallel currents flowing in the same direction attract or repel each-other?

PLEASE ONLY ANSWER THIS QUESTION IF YOU ARE 100% SURE THAT YOUR ANSWER IS CORRECT.
THIS IS FOR MY FINAL TEST.

Explanation / Answer

a)suppose electron is launched towards right on exam sheet ,by flemimg left hand rule the force will be upwards so motion will be clockwise

(b) At equilibrium the electric field inside conductor is zero and electric potential is constant at all points inside conductor this is because conductor does not store any charge inside it .All the charge is concentrated on the surface .SInce there is no charge inside .so by Gauss law ,the electric field inside is zero.

(c)The equipotential lines and electric field are perpendicular to each other because on equipotential (lines with same potentuial)line ,their is always 0 electric field everywhere so electric field is perpendicular to these lines so that perpendicular component(cos(90)=0) is always zero

(d) The two wires will attract each other.because the magnetic field direction on both wire due to other will be opposite so force will be towards each other

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