charging capacitor v2
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If the circuit is a long straight line without the capacitor and with a current I flowing, one may apply to find the magnetic field at point P 1, distance R away from the current.
6 FAQs about [Magnetic field of a circuit containing a capacitor]
What is a magnetic field outside a capacitor?
Outside the capacitor, the magnetic field has the same form as that of a wire which carries current I. Maxwell invented the concept of displacement current to insure that eq. (1) would lead to such results.
How is the magnetic field created between capacitor plates?
Bartlett made an analytical calculation of the magnetic field between the capacitor plates to show with some approximation that it is actually created by the linear current in the lead wire and the radial current in the plates. Milsom provided numerical results together with an excellent compact review of the topic.
Can a capacitor create a magnetic field?
I saw an exercise example where we changed the voltage across a capacitor and thus created a magnetic field between them.But some websites state that as long as there is no current - charge movement at the place of interest, there is no magnetic field being created. I read the same about the capacitor in particular.
Why does a capacitor have a higher electric field than a current?
Because the current is increasing the charge on the capacitor's plates, the electric field between the plates is increasing, and the rate of change of electric field gives the correct value for the field B found above. Note that in the question above dΦE dt d Φ E d t is ∂E/∂t in the wikipedia quote.
Can a capacitor and inductor oscillate without a source of EMF?
It is worth noting that both capacitors and inductors store energy, in their electric and magnetic fields, respectively. A circuit containing both an inductor (L) and a capacitor (C) can oscillate without a source of emf by shifting the energy stored in the circuit between the electric and magnetic fields.
What happens when a capacitor is closed?
UC = 1 2q2 0 C. When the switch is closed, the capacitor begins to discharge, producing a current in the circuit. The current, in turn, creates a magnetic field in the inductor. The net effect of this process is a transfer of energy from the capacitor, with its diminishing electric field, to the inductor, with its increasing magnetic field.