Physics
Horse shoe magnets are used in :
- d.c. motor
- a.c. generator
- electric bell
- all of the above
Related Questions
On reversing the direction of current in a wire, the magnetic field produced by it:
- gets reversed in direction
- increases in strength
- decreases in strength
- remains unchanged in strength and direction.
A strong permanent magnet is made of :
- soft iron
- steel
- nickel
- copper
How is magnetic field due to a straight current carrying wire affected if current in wire is (a) decreased, (b) reversed?
A student draws three magnetic field lines 1, 2, 3 of a bar magnet using a compass needle. Are all the lines of force correctly drawn? Give reason for your answer.
