A ring of radius 2.50 cm has a uniform linear charge density of 15.0 nC/m. It is observed that when a point charge Q is placed at the center of the ring, the electric field at a point at the central axis of the ring at a distance of 12.0 cm from its center is zero. What is the value of Q?

Ithink your answer is d

Molybdeum(mo)orruthenium (ru)actually, elements with similar chemical properties as technetium would bemn, re, and bh. this is because elements in the same group/family (column) have similar chemical properties. elements in the same period (row) have the same number of energy levels (or shells).