Find the electric field strength at the point midway between the charges + 10 ^ -8 and -4 * 10 ^ -8 C

| May 28, 2021 | education

Find the electric field strength at the point midway between the charges + 10 ^ -8 and -4 * 10 ^ -8 C, located at a distance of 20 cm. Is it possible to indicate the point between these charges at which the electric field strength is zero.

Since the distance between the charges is 20 cm, the distance from the point to the charges will be equal to:
20: 2 = 10 cm = 0.1 m
The electric field strength is determined by the formula: | E | = 1 / 4π εε0 * | q | / r
where q is the amount of charge, r is the distance. By the principle of superposition, we get:
E = 1 / 4π εε0 * 4q2 / r-1 / 4π εε0 * q1 / r = 1 / 4π εε0 * / r | q2-q1 |.
E = 10 ^ -10 / 0.1 (4 * 10 ^ -8 + 10 ^ -8) = 5 * 10 ^ -19 N / m.
Since the charges have opposite signs, such a point does not exist.



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