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)

NO , the electric does not show the trajectory.electric field lines point in the direction of electric force acting on a positive charge.

ii)

here , electric force = electric field * charge

as the electric field and charge is same on electron and proton

hence , the magnitude of electric force will be same on electron and proton just in oposite direction.

iii)

inserting a dielectric in an isolated capacitor ,

as the capacitance will increase

energy stored in capacitor = 0.5 * Q^2/C

as charge is same

hence , the energy stored in capacitor will decrease

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