CBSE Class 12-science Answered
a bar magnet m is dropped vertically through the coil C.Draw the of the graph between emf induced in the coil vs time,Why is the negative peak longer than the positive peak?
Asked by surbhimaindola49 | 17 Feb, 2018, 08:11: AM
Expert Answer
As shown in figure when a bar magnet is dropped across a current carrying coil, emf is induced in the coil. emf appears as pulses when the bar magnet enters the loop and exits the loop. Induced emf is equal in magnitude to rate of change of magnetic flux but sign of emf is opposit to sign of flux change.
if flux increases emf is negative and if the flux decreases then emf is positive. when the bar magnet enters there is a change in manetic flux across the coil anf flux increases hence induced emf is negative. Similarly when the bar magnet xits, induce emf is positive. when the bar magnet is fully inside there will not be any flux change and no induced emf in the coil.
When the bar magnet enters emf induced in the coil and creates induced current and induced magnetic field. This induced magnetic field opposes the magnetic fileld of bar magnet and reduces the falling speed of bar magnet. Due to this bar magnet entrance will present more time with coil and we get longer pulse. When bar magnet leaves this slowing effect is reduced and spped of falling magnet will be more. Hence at the time of exit the pulse length of induced emf is shorter.
Answered by Thiyagarajan K | 19 Feb, 2018, 04:05: PM
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