When the communication line run parallel to the power lines in close proximity
P. The electromagnetic effect produces current due to induction resulting its superposition on the speech signal of the communication line causing distortion
Q. The electrostatic effect raises the potential of the communication circuit as a whole and thereby posing a threat of damage to the communication equipments
R. The conductors of the power line is regularly transposed to balance the capacitance of the lines
Which of the following combinations is valid?
A) R only B) P, Q & R C) P & Q only D) P & R only