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Self Induction, , Solenoid, 6 Soft iron core., , @3w @3w, , , , , , , , , , , , 1, 6VDC @ Fig.3.1 SVAC, , , , Let’s examine the above experiments. The bulb in the circuit glows when the circuit, is kept switched on., , >, , >, , >, , >, , >, , >, , In which circuit does the bulb give a light with low intensity?, , * Second circuit(b), , In which circuit is a magnetic field developed around the solenoid?, * On both circuit, , In which circuit is a varying magnetic field developed around the solenoid?, * Second circuit(b), , If so in which circuit is a continuous emf induced?, , * On Second circuit(b), , Why does the intensity of light decrease in that circuit?, , * Back emf more, , What is this phenomenon? Explain., , * Self induction, , , , >, , , , The change in magnetic flux due to the flow of an AC in a solenoid will, generate a back emf in the same solenoid in a direction opposite to that applied, to it. This phenomenon is known as the self induction., , , , Have you understood the reason behind the decrease in the intensity of light in, the second circuit?, , * When AC passes through a solenoid, a changing magnetic field is generated, around it. Due to this an induced emf is generated inside the solenoid. This, induced emf is in a direction opposite to that applied on the coil. Hence this is, a back emf. This back emf reduces the effective voltage in the circuit.