1. An iron rod of area 0.1 m2 is in a magnetic field of induction 4 x 10-3 Wb m-2. If the coil is reversed in a time of 50 ms, calculate the emf induced in it.
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Answer:
12th
Physics
Electromagnetic Induction
Introduction to Electromagnetic Induction
A magnetic field of flux de...
PHYSICS
A magnetic field of flux density 1.0Wbm
−2
acts normal to a 80 turn coil of 0.01m
2
area. The e.m.f. induced in it, if this coil is removed from the field in 0.1 second is
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ANSWER
Answer is A.
The magnetic flux ϕ=B×A depends on the magnetic field, the area of the loop, and their relative orientation.
In this case, the magnetic field of flux density 1.0Wbm
−2
acts normal to a 80 turns coil of 0.01m
2
area.
Therefore, the Magnetic flux in 80 turns of coil = 0.01 * 80 = 0.8 T.
The time derivative of the flux is given as, dϕ/dt.
Therefore, the e.m.f induced in it, if this coil is removed from the field in 0.1 second is dϕ/dt = 0.8/0.1 = 8 V