Name the instrument in which you observed the hysteresis loopa.Cathode Ray Tubeb.Multimeterc.Cathode Ray Oscilloscope

The instrument used to observe the hysteresis loop is the Cathode Ray Oscilloscope (CRO).

Explanation:

1. Functionality of the Cathode Ray Oscilloscope (CRO): The CRO is designed to visually represent electrical signals on a screen, allowing the display of voltage variations over time. This feature makes it particularly useful for analyzing dynamic phenomena in systems where hysteresis is present, such as magnetic materials.

2. Hysteresis Loop: The hysteresis loop illustrates the relationship between an external magnetic field and the magnetization of a material. The CRO can capture and display this loop as it allows for the plotting of two variables against each other (such as magnetic field strength vs. magnetization).

3. Comparison with Other Instruments:

   • The Cathode Ray Tube (CRT) is a component of the CRO and does not independently measure or display data.
   • A Multimeter is used to measure voltage, current, and resistance but does not have the capability to visualize the hysteresis loop.

In conclusion, the correct choice for observing the hysteresis loop is the Cathode Ray Oscilloscope (CRO).