CBSE Class 12-science Answered
Why a small resistor is usually put in parallel to the current carrying coil of an electromagnet?
Asked by Topperlearning User | 07 Jul, 2015, 09:08: AM
Expert Answer
When the current in the coil of a large electromagnet is switched off the magnetic flux changes at a very high rate. Thus the induced emf is very high and may cause sparking and can damage the insulation. A small resistor connected in parallel provides a conducting path to the induced emf and thus reduces the risk of sparking.
Answered by | 07 Jul, 2015, 11:08: AM
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