First slide

Electric field

Question

Two identical point charges are placed at a separation of d. P is a point on the line joining the charges, at a distance x from any one charge. The field at P is E. E is plotted against x for values of x from close to zero to slightly less than d. Which of the following represents the resulting curve

Moderate

A
B
C
D

Solution

At mid point, E=0
Before mid point, E is positive. This is maximum near the charge and decreases towards mid point.
After mid point, E is negative, The curve crosses x-axis at x = d/2.
From center to end, E approaches negative infinity.
The variation is shown by curve (c).

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