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Question

An iron rod is inserted in a solenoid coil as shown in the above diagram. Find out the correct statements which describes the quantities induced into the iron core when SW1 is closed?
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A
Lines of force emanate from side y
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B
Lines of force emanate from side x
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C
Side y becomes a south magnetic pole
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D
Side x becomes a north magnetic pole
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E
The electric field cancels the magnetic field
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Solution

The correct option is B Lines of force emanate from side x
When switch SW1 is closed, solenoid will become a magnet, as we see that current is entering in the wire (solenoid) from side y.If we look at side y in front of its cross section , we will find that the direction of current in wire is clockwise.Clockwise means y side is the south (S) pole of solenoid that's why lines of force enters from this side and emanate from other side x.

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