Origin of the electric and the gravitational forces? Was known in 1911 A.D. Was known in 1811 A.D. Was known in 1711 A.D. Is still unknown Right Answer: Is still unknown Share : December 16, 2017 Asghar Khan Physics Total 0 Votes: 0 0 Tell us how can we improve this Mcqs? Captcha: + = Verify Human or Spambot ? Related Mcqs Check Below -Linear momentum of a photon is?A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor is?Which law of motion is called law of inertia?