carrying an alternating current (A.C.) creates a varying magnetic field, which induces an e.m.f. in a secondary search coil placed within it. Apparatus Required
: Ensure all wire connections are tight to maintain a steady current.
: Keep the rheostat (which acts as a solenoid) away from the search coils to avoid interference.
: Repeat measurements multiple times to calculate an average and minimize random errors. Conclusion : For a fixed current and geometry, the induced physics experiment 9 stpm sem 2
: To investigate the relationship between the induced e.m.f. ( The number of turns ( ) of a secondary coil. The frequency ( ) of the a.c. signal supplied to a solenoid. Apparatus : Signal generator (to provide a.c. current).
between calculated C and the capacitor’s labeled value. [ % \textdiff = \fracC_exp - C_ratedC_rated \times 100% ] A difference within 10% is acceptable for STPM.
Cathode-ray oscilloscope (CRO) or digital multimeter (to measure induced e.m.f.). Ammeter (to ensure current remains constant). Rheostat and connecting wires. carrying an alternating current (A
: Using the gradient of the graph and known constants (frequency, current, and cross-sectional area), calculate the permeability of free space. The theoretical value is approximately Precautions and Common Errors
Understanding this experiment is not just for exams—it has real engineering relevance:
Before stepping into the laboratory, it is vital to understand the physics governing the experiment. : Keep the rheostat (which acts as a
: Instrument drift in the signal generator or fluctuations in the multimeter readings can affect results.
Moreover, this experiment has real-world applications. Understanding RC time constants is fundamental to designing pacemaker timing circuits, camera flash units, and debouncing switches in digital electronics. In research, similar methods are used to characterize dielectric materials and measure unknown capacitances or resistances.