Final answer:
It is true that a multimeter with an inductive pickup does not have to touch the metal components of a circuit, as it measures through magnetic fields without the need for direct contact. This prevents the instrument from affecting the circuit's operation.
Step-by-step explanation:
The statement that a multimeter with an inductive pickup does not have to touch the metal components of a circuit is indeed True. Using an inductive pickup, measurements can be taken without direct electrical contact. This is useful in preventing the multimeter from affecting the circuit being tested. Inductive pickups work by detecting the magnetic fields associated with electric currents, allowing them to sense current flow without interruption.
For example, when using metal detectors, as the inductive pickup comes near a piece of metal, the self-inductance of the coil changes. This causes a shift in the resonant frequency of a circuit, thereby allowing the detection without direct contact.
When measuring circuits, it is crucial to not interfere with the operation of the circuit. Instruments like digital meters that use null measurements or inductive pickups can take measurements without drawing current, not altering the circuit at all.