Question

Find neutral point between two point charges 4Q and Q.

Answer 1

Answer:

Let intensity of electric field be zero at distance x from charge q. Thus the point will be 30-x away from charge 4q. For electric field intensity to be equal, electric field due to two points should be equal. Thus this point will be 10 cm from +q and 30-10 = 20 cm from charge +4q.

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Answer 2

Answer:

12

Explanation:

$x^{2} \geq \sqrt{x} \alpha \lim_{n \to \infty} a_n$