Correct Answer : Option (D) : From 1C to -4C
Explanation : Since the charges are unlike, the force will be attractive. Thus the force directs from 1C to -4C.
Correct Answer : Option (C) : Power radiated per unit solid angle in that direction
Correct Answer : Option (B) : A quarter wave line
Correct Answer : Option (D) : Larger wavelength than in the free space