What must be true in order for magnetism to induce an electric current in a wire? there needs to be a switch in the circuit. there cannot be a switch in the circuit. the wire must be part of a closed circuit. the wire must be part of an open circuit. mark this and return save and exit

The correct " The wire must be part of a closed circuit."

The three conditions that must be met in odder to have a current flowing in a wire are : The wire has to be a conductor that is  connected in a closed circuit , and you must have an emf to drive the charges in a certain direction in the wire.  A magnet that provides a changing flux will induce an emf that drives current.  When the magnet produces this emf, a current will only flow though the conducting wire if and only if the wire s part of a closed circuit.

Clearly, the correct answer is " The wire must be part of a closed circuit."

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.