## Magnetism and Electromagnetism How does the magnetic compass needle behave in a magnetic field?

It starts rotating
None of the listed here
It assures a position which follows a line of magnetic flux
It assures a position right angle to magnetic field

## Magnetism and Electromagnetism Fleming's left hand rule is used to find

Direction of force on a current carrying conductor in a magnetic field
Direction of magnetic field due to current carrying conductor
Direction of flux in a solenoid
Polarity of a magnetic pole

## Magnetism and Electromagnetism In a simple magnetic field the strength of magnet flux

increases continuously from initial value to final value
is constant and has same value in energy part of the magnetic field
decreases continuously from initial value to final value
first increases and then decreases till it becomes zero

## Magnetism and Electromagnetism The direction of a magnetic field within a magnet is

front to back
back to front
from south to north
from north to south

## 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?

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

12 mA
120 mA
16 mA
1.7 mA