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The diagram shows a spiral coil wound on a hollow cardboard tube AB. A magnetic compass is placed close to it. Current flows through the coil on closing the key. (a) What will be the polarity at the ends A and B? (b) How will the compass needle be affected? Give reason. |
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Answer» The diagram shows a spiral coil wound on a hollow cardboard tube AB. A magnetic compass is placed close to it. Current flows through the coil on closing the key. (a) What will be the polarity at the ends A and B? (b) How will the compass needle be affected? Give reason.
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