An air conditioner is fixed to a closed room at 30°C where relative humidity is 62.5%. Dew point of the air inside the room is 22 °C. After some time when it was switched on, temperature and the relative humidity decreased to 22 °C and 40% respectively. Then the air conditioner is switched off and allowed to stay for little while and then temperature of air increased to 30 °C. New relative humidity of the room is (1) 62.5%
(2) 50%
(3) 40%
(4) 30%
(5) 25%

We will use a video to study faraday’s law of electromagnetic induction by analyzing the induction that occurs due a coil of copper wire sliding along an air track that passes through an external magnetic field. specifically, we will: examine some of the main principles behind faraday’s law. apply lenz’s law to determine the direction of the induced emf. take measurements of the induced emf from the voltmeter as the coil passes into and out of the external magnetic field. use the horizontal scale provided to determine the speed of the coil. calculate the magnetic field induced in the coil as it passes into and out of the external magnetic field.