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Inductance_and_RL_Circuits

# Inductance_and_RL_Circuits - Faradays Law Inductance and RL...

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Faraday’s Law, Inductance, and RL Circuits NAME: ____________________________________ NAME: ____________________________________ NAME: ____________________________________ RECITATION SECTION: __________________________ INSTRUCTOR: __________________________ DATE: __________________________ This activity is based on the following concepts: Faraday's Law of Induction: If the magnetic flux Φ B through a closed loop C changes with time, an induced electric field E is created. The rate of change of the magnetic flux and the electric field are related by: dt d s d E B C Φ - = Self-induction: If a current i is a coil changes with time, an emf is induced in the coil. o This self-induced emf is dt di L L - = ε , where L is the inductance of the coil (inductor). o Inductance is measured in units of henries (H) Rules of thumb for RL circuits: o When you make a change in an RL circuit, initially, an inductor acts to oppose the change in current. A long time later, it acts like an ordinary piece of wire. o Circuits with inductors resist any changes in current; so, if you throw a switch, the current through an inductor cannot change instantaneously (unless, of course, you break the circuit…)

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Q1. The figure below shows the cross-sectional view of an ideal solenoid with n turns per unit
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