State Faraday's law of electromagnetic induction.
A simple laminated iron-core transformer is connected to a primary voltage of 240 V240\text{ V}240 V, 50 Hz50\text{ Hz}50 Hz. The output voltage from the secondary coil is 12 V12\text{ V}12 V. The primary coil has 800 turns800\text{ turns}800 turns.
Calculate the number of turns on the secondary coil.
At one particular instant, the output voltage from the transformer is 9.0 V9.0\text{ V}9.0 V. Calculate the change in magnetic flux experienced by the secondary coil in a short time interval of 2.5 ms2.5\text{ ms}2.5 ms and state its unit. Assume that the output voltage from the transformer remains constant at 9.0 V9.0\text{ V}9.0 V over this time interval.
