P5. If the current in the long straight wire is decreasing, the current induced in the coil is A. clockwise B. counter clockwise P6. If we close the switch,

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Presentation transcript:

P5. If the current in the long straight wire is decreasing, the current induced in the coil is A. clockwise B. counter clockwise P6. If we close the switch, the current induced in the coil at the right is If after a long time we open the switch, the current induced in the coil is______

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Tesla coil (1900)

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Inductance How fast can we establish a current in a coil, solenoid or transformer? Faraday’s law prevents magnetic fluxes from growing infinitely fast

Inductors as circuit elements A solenoid (usually with iron core) as part of a circuit is described by its inductance L (in Henries) and is known as an inductor Uses of inductors: Suppress current spikes Store energy temporarily Generate high voltage by interrupting currents Resonant circuit between C and L

Inductance A solenoid fights the change in its flux and current!

Inductance At short times\ (right when a change is attempted) L acts like an opposing battery (that later fades to zero V). Called “back emf” or “reverse voltage”, its V is exactly enough so that I can’t change instantly At long times, L acts like a wire or “short” (because current isn’t changing then…nothing to fight)

It takes time to start, stop a current in an inductor

P1. Right after the switch is closed, which bulb is bright. A. Left B P1. Right after the switch is closed, which bulb is bright? A. Left B. Right C. neither D. both P2. Long after the switch is closed, which bulb is bright?

P3. After the switch is closed, the bulb A. is bright then dims B P3. After the switch is closed, the bulb A. is bright then dims B. is dim then brightens C. starts dim, gets bright, then dim again D. starts bright, gets dim, then bright again

Generating sparks (10000 V) from about 10 V Switch opens periodically the “coil” spark plugs https://www.youtube.com/watch?v=W94iksaQwUo