COMEDK · Physics · 17. Electrostatics
Two point charges \(P = +25\ \mu C\) and \(Q = -16\ \mu C\) are placed 5 cm apart. Find the position of the point at which the resultant electric field is zero:
- A 2.5cm from Q and 2.5cm from P on the dipole axis
- B 1cm from Q and 4cm from P on the dipole axis
- C 20cm from Q and 25cm from P on the dipole axis
- D 25cm from Q and 20cm from P on the dipole axis
Answer & Solution
Correct Answer
(C) 20cm from Q and 25cm from P on the dipole axis
Step-by-step Solution
Detailed explanation
Let the point where the electric field is zero be at a distance \(x\) from charge \(Q\). Since the charges are of opposite signs, the null point lies outside the region between the charges, closer to the charge with the smaller magnitude (\(Q\)). Distance of the point from…
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