3.3 Point charge R carrying a charge of + 6,5 x 10°C is placed 3 mm away from point X as shown in the diagram below. R mafio 3 mm 3 mm Calculate the net electric field at X.​

Identify the correct relation showing that the radius r of the orbit of a moon of a given planet can be determined from the radius r of the planet, the acceleration of gravity at the surface of the planet, and the time τ required by the moon to complete one full revolution about the planet. determine the acceleration of gravity at the surface of the planet jupiter knowing that r = 71 492 km and that t= 3.551 days and r= 670.9 × 10^3 km for its moon europa.