Briefly answer each of the following questions in 2-3 sentences. i) Do electric

Question

Briefly answer each of the following questions in 2-3 sentences. i) Do electric field lines point along the trajectory of moving particles that are positively charged? Why or why not? ii) An electron and a proton are released in a region of space where the electric field is vertically downward. How do the electric forces acting on the electron and proton compare? iii) Does inserting a dielectric into a charged and isolated capacitor increase or decrease the energy stored in the capacitor? Explain your answer.

Explanation / Answer

i)

Electric field lines point towards low potential from high potential

ii)

A positive charge or proton moves along the direction of electric field

A negative charge moves along the opposite direction of electric field and

The direction of electrostatic force on electron is towards the proton from electron.

iii)

We know that

The capacitance of the capacitor is given by

C =eoA/d

If we increase a dielectric for the capacitor then the capacitance increases by k times i.e,

C' =keoA/d =kC

Now the energy stored will be equal tot

U =(1/2)C'V2=(1/2)(keoA/d)V2

Therefore the energy also increases

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