Magnetism and Electromagnetism
The stray line of magnetic flux is defined as

A line of magnetic flux which does not follow the designed path
A line vertical to the flux lines
The mean length of a ring shaped coil
A line of magnetic flux in a non-uniform field

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Magnetism and Electromagnetism
Main causes of noisy solenoid are

None of these
uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts
strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force
Both of the listed here

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Magnetism and Electromagnetism
A certain amount of current flows through a ring shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil?

First increases and then decreases depending on the depth of iron in¬sertion
Increases
Remains same
Decreases

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