During a 72-ms interval, a change in the current in a primary coil occurs. this change leads to the appearance of a 6.0-ma current in a nearby secondary coil. the secondary coil is part of a circuit in which the resistance is 12 ω. the mutual inductance between the two coils is 3.2 mh. what is the change in the primary current?
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Ответ:
so change in primary current is 1.620 A
Explanation:
Given data
current I =6.0-mA = 6 × 10^(-3) A
resistance R = 12 Ω
mutual inductance M = 3.2 mH = 3.2 × 10^(-3) H
dt = 72-ms = 72 × 10^-(3) s
to find out
change in the primary current
solution
we know that
Electric and magnetic fields in secondary coil = mutual inductance × change in primary current / dt 1
and we know also that Electric and magnetic fields in secondary coil = resistance × current
so = 6 × 10^(-3) × 12 = 72 × 10^(-3) volts
so that we say
change in primary current from equation 1
change in primary current = Electric and magnetic fields in secondary coil × dt / mutual inductance
change in primary current = 72 × 10^(-3) × 72 × 10^(-3) / 3.2 × 10^(-3)
change in primary current = 1.620
so change in primary current is 1.620 A
Ответ: