Which of the following statements is false regarding a current carrying solenoid?

The magnetic field strength of a solenoid can be altered.

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Using soft iron as core in a solenoid increases its magnetic field strength.

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The magnetic field produced by a current carrying solenoid is not similar to a bar magnet.

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The polarity of a solenoid can be changed.

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Solution

The correct option is C The magnetic field produced by a current carrying solenoid is not similar to a bar magnet.
A current carrying solenoid behaves like a bar magnet with fixed polarities at its ends. The magnetic field generated by a current carrying solenoid is similar to a bar magnet. The polarity of a solenoid can be reversed by changing the direction of current. The field strength due to a solenoid can be changed by changing the electric current or changing number of turns per unit length.

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Can the polarity of magnetic field produced by a current carrying solenoid can be reversed by reversing the ends of the solenoid ie, by connecting upside down?

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