Question

3. Place 4 positive charges in a square with 2 meter sides. On your graph paper, sketch the E-Field.

What is the magnitude of the field in the center of the square?

How would the field differ if the charges were negative?

Describe the field outside of the square... If you were looking at the field from 20 meters away, where would it look like all the field lines originated?

Answer 1

a) when 4 +ve charge placed on corner of square.

Enet on center

=  

= kq/()²  [ 1i + 1j - 1i +1j -1i -1j + 1i -1j ]

= 0

2) if q -s -ve

=  

= k(-q)/()²  [ 1i + 1j - 1i +1j -1i -1j + 1i -1j ]

= 0

c)