# Magnetism And Matter

## Assertion(A) : The ferro magnetic substances do not obey curie's law. Reason(R) : At curie point ferromagnetic substances start behaving as a paramagnetic substances.

A
Both A, R are true and R is the correct explanation of A
B
Both A, R are true and R is not correct explanation of A
C
A is true, R is false
D
A is false R is true
Medium
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## For soft iron, in comparison with steel :

A
hysteresis loss is more
B
hysteresis loss is same
C
hysteresis loss is less
D
hysteresis loss is negligible
Medium
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## The lines of force of a bar magnet are:

A
Parallel and straight
B
Concentric circles
C
Curved lines
D
Curved closed loops
Medium
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## The area enclosed by a hysteresis loop is a measure of

A
retentivity
B
susceptibility
C
permeability
D
energy loss per cycle
Medium
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## Assertion(A): graph for a diamagnetic material is a straight line parallel to axis Reason (R): This is because susceptibility of a diamagnetic material is not affected by temperature

A
both A,R are true and R is the correct explanation of A
B
both A,R are true and R is not correct explanation of A
C
A is true, R is false
D
A is false R is true
Medium
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## The incorrect statement regarding the lines of force of the magnetic field B is:

A
magnetic intensity is a measure of lines of force passing through unit area held normal to it.
B
magnetic lines of force form a closed curve.
C
inside a magnet, its magnetic lines of force move from the north pole of a magnet towards its south pole.
D
magnetic lines of force never cut each other.
Medium
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