Physics, 17.10.2019 11:00 1341220857

2. explain the mechanism by which ac (alternating current) through the primary circuit of a transformer produces an alternating voltage and current in the secondary coil. then explain why this would or would not work with dc (nonalternating current) in the primary coil.

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Answer from: andrewsaul04

Explanation:

A transformer consists of core of soft iron (a material that can be easily magnetized/demagnetized), to which two coils are attached at both ends.

An alternating current in the primary coil produces a magnetic field around the coil, magnetizing the iron core; therefore, the same magnetic field produces a magnetic flux in the secondary coil.

Since the AC current in the primary coil is variable, then the magnetic field also changes, so the magnetic flux through the secondary coil changes over time; therefore, an electromotive force (and so, a current) is induced in the secondary coil, according to Faraday-Newmann-Lenz:

$\epsilon= - \frac{d\Phi}{dt}$

where

$\epsilon$ is the induced emf

$\frac{d\Phi}{dt}$ is the rate of change of magnetic flux through the secondary coil

We notice that this mechanism would not work if the current in the primary coil is a DC current: in fact, a DC current has always a constant value, so there is no change in the magnetic field, therefore no change in the magnetic flux through the secondary coil and no emf induced.

Answer from: Quest

not really sure but thinking 1.54 mm/us

Answer from: Quest

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm. the wire diameter is d = 0.9 mm. the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2) in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

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2. explain the mechanism by which ac (alternating current) through the primary circuit of a transfor...

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