Explain magnetic effect employed in measuring instrument.
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Magnetic Effect: 

I) In PMMC meters: 

➢ When a current is passed through a conductor, magnetic field is produced round the conductor. Due to this field when current carrying conductor is placed in a magnetic field it experiences a mechanical force. Examples: PMMC, galvanometer 

II) In Moving Iron Type meters: 

➢ When we bring one permanent magnet near to another electromagnet then there is a force of attraction or repulsion depending on the direction of current in the coil of electromagnet. ➢ Examples: Moving iron type instruments, Moving coil type instruments 

III) In Electrodynamic meters: When a current is passed through a conductor, magnetic field is produced round the conductor. Due to this field when current carrying conductor is placed in a magnetic field it experiences a mechanical force. 

Examples: Electrodynamometer type instruments, Induction type instrument. 

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