Astep-index multimode glass fibre, with a core diameter of 50 μm and cladding refractive index of 1.45, is designed to limit the intermodal dispersion to 10ns/km.
a. find its acceptance angle
b. calculate the maximum bit rate for transmission over a distance of 20 km.

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?

Using gravity, an elephant can pull a mouse towards it from the ground. true or false explain why. will give brainliest if answered fast and the best explanation