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The average emf induced in the secondary coil is 0.10 V when the current in the primary coil changes from 3.2 to 2.0 A in 0.10...Asked by nj
The average emf induced in the secondary coil is 0.12 V when the current in the primary coil changes from 3.8 to 1.1 A in 0.14 s. What is the mutual inductance of the coils?
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Answered by
drwls
V2 = M12*dI1/dt
You want the mutual inductance M12.
The rate of change of current in loop 2 is dI1/dt = 2.7/0.14 = 19.3 amps/s
You do the numbers.
0.12 V = M12*19.3 amps/s
M12 will be in Henries
It is somewhat unusual to talk of "primary" and "secondary" coils when dealing with mutual inductance. That language is usually applied to transformers, but would be OK there, too.
Note that M12 = M21, although that is not obvious.
You want the mutual inductance M12.
The rate of change of current in loop 2 is dI1/dt = 2.7/0.14 = 19.3 amps/s
You do the numbers.
0.12 V = M12*19.3 amps/s
M12 will be in Henries
It is somewhat unusual to talk of "primary" and "secondary" coils when dealing with mutual inductance. That language is usually applied to transformers, but would be OK there, too.
Note that M12 = M21, although that is not obvious.
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