Ankit Gupta Posted August 16, 2013 Share Posted August 16, 2013 we all know that according ti kirchoff's loop rule , the potential difference across a loop is zero then how emf induces in a close loop when a bar magnet is taken away or towards it ? Link to comment Share on other sites More sharing options...
Didymus Posted August 16, 2013 Share Posted August 16, 2013 Can you clarify the question a bit more? Sounds like the answer is a quick, simple: Because faraday was a friggin BOSS. But what he discovered was more about wires that contained multiple loops as part of a circuit. Or, are you asking about a literal single loop with nothing outside that loop. If you tried to faradize a ring of wire, I'm not sure you would get a voltage because although there would be electromagnetic pressure.... It would be uniform. No pressure differential, no motion. Link to comment Share on other sites More sharing options...
Delbert Posted September 8, 2013 Share Posted September 8, 2013 we all know that according ti kirchoff's loop rule , the potential difference across a loop is zero then how emf induces in a close loop when a bar magnet is taken away or towards it ? I thought Kirchoff's law was to do with electrical current, such that the currents entering a given junction must equal the currents leaving it. Link to comment Share on other sites More sharing options...
Toffo Posted September 8, 2013 Share Posted September 8, 2013 we all know that according ti kirchoff's loop rule , the potential difference across a loop is zero then how emf induces in a close loop when a bar magnet is taken away or towards it ? Why is the potential difference across a loop zero? Because electron gains no energy when making one round around the loop. Why does electron not gain any energy? Because the EMF pushes an electron, but friction force pushes an electron into the opposite direction. In this "abnormal" circuit that we are discussing here, at every point of the circuit EMF = friction force. In a "normal" circuit EMF is less homogeneously distributed. -2 Link to comment Share on other sites More sharing options...
Enthalpy Posted September 9, 2013 Share Posted September 9, 2013 In the closed loop, you have more elements than the circuit portion where the EMF is induced. For instance the voltmeter that measures the induced voltage. It could be resistors that drop this voltage, batteries, capacitors, coils that store the produced electrical energy... Link to comment Share on other sites More sharing options...
Ankit Gupta Posted September 13, 2013 Author Share Posted September 13, 2013 I thought Kirchoff's law was to do with electrical current, such that the currents entering a given junction must equal the currents leaving it. there are two rules one is junction rule which you have said and another is loop rule about which i was asking In the closed loop, you have more elements than the circuit portion where the EMF is induced. For instance the voltmeter that measures the induced voltage. It could be resistors that drop this voltage, batteries, capacitors, coils that store the produced electrical energy... i didn't understand would you please more specify it ? Link to comment Share on other sites More sharing options...
studiot Posted September 13, 2013 Share Posted September 13, 2013 Kirchoff's rules have little or nothing to do with bar magnets and induction. That is Faraday's law. Kirchoff's laws enable you to solve (linear) electrical circuits for voltage and current, given the connectivity between components. Link to comment Share on other sites More sharing options...
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