If a proton and electron are placed separately in an electric field, what will h

Question

If a proton and electron are placed separately in an electric field, what will happen? (choose all that are true)

(a) The electron is attracted to low voltage and the proton is attracted to high voltage.

(b) The electron is attracted to high voltage and the proton is attracted to low voltage.

(c) The electron and proton are attracted to low voltage.

(d) The electron and proton are attracted to high voltage.

Imagine you have a single point charge in space. You measure the potential at 1.0 m from the charge to be 0.01 V and the potential at 0.5m to be 0.04 V. Is the charge positive or negative?

(a) Positive.

(b) Negative.

(c) Actually, it is neutral.

(d) We can't determine this without more information.

Explanation / Answer

a) When electron is placed in an electric field,as the direction of electron field in any elctric field is opposite to that of electric field i.e. from negative(low)voltage to positive(high) voltage,the electron will be attracted to the positive or high voltage.

On the same lines,if a proton is placed inside the same electric field,it will be in the direction of the electric field i.e. from positive(high) to negative(low) voltage,it will be attracted to the low voltage.Option B

b) The potential for a pint charge is given by Kq/r.Here potential is invrsely proportional to the distance and hence if the distance is halved,s in this case,the potential should double.Also the potential will remain same for positive and negative charge of same magnitude.Hence we cant determine the type of charge without more information.Option D

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