Physics, 12.10.2019 11:50 jennifer7037

If the electric field at some point on the line between two charges is zero, what do you know about the charges?

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Answer from: tabisulaprinces2084

The charges have same sign

Explanation:

The total electric field at a point on the line between the two charges is given by the resultant of the two electric fields produced by the two charges, which means that we must take them considering their direction.

In order to have a total electric field of zero, the two fields must have equal magnitude and opposite direction. Let's analyze different cases. Remember we are analyzing the fields at a point P located between the two charges, so it is located on the right of the left charge and on the left of the right charge:

1- Charge on the left: positive, charge on the right: negative

At point P, the electric field produced by the left charge is to the right, while the electric field produced by the right charge is to the right also, so this configuration is NOT possible

2- Charge on the left: positive, charge on the right: positive

At point P, the electric field produced by the left charge is to the right, while the electric field produced by the right charge is to the left, so this configuration is possible

3- Charge on the left: negative, charge on the right: negative

At point P, the electric field produced by the left charge is to the left, while the electric field produced by the right charge is to the right, so this configuration is possible

4- Charge on the left: negative, charge on the right: positive

At point P, the electric field produced by the left charge is to the left, while the electric field produced by the right charge is to the left also, so this configuration is NOT possible

So, the only possible configurations are the ones where the two charges have same sign.

Answer from: Quest

Is a vector quantity that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

Answer from: Quest

None. nothing. zero. zilch.

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If the electric field at some point on the line between two charges is zero, what do you know about...