Raj is in XII standard. His Physics teacher demonstrated an experiment to explain Faraday’s laws of eletomagnetic induction. Raj interrupted her lecture and asked. “Is there any possibility of induced emf due to the earth’s magnetism”? The teacher was stunned for a moment and gave this question for group discussion. Finally the students came out with correct answer.
(a) Write the values that you learnt from this incident.
(b) What can be the reason for Raj’s questions ?
(a) Team spirit and curiosity.
(b) When the wire in N-S direction is dropped feely, none of the components of earth’s magnetic field is intercepted. So, no induced emf is produced. When the wire is dropped freely in E-W direction horizontal component of earth’s magnetic field is intercepted. So emf is induced in the coil.