Physics
Horse shoe magnets are used in :
- d.c. motor
- a.c. generator
- electric bell
- all of the above
Related Questions
A strong permanent magnet is made of :
- soft iron
- steel
- nickel
- copper
The type of magnet used to study the magnetic properties of a substance in a magnetic field and for scientific research is :
- permanent magnet
- bar magnet
- electromagnet
- none of the above
How is magnetic field due to a straight current carrying wire affected if current in wire is (a) decreased, (b) reversed?
A straight wire lying in a horizontal plane carries a current from north to south. (a) What will be the direction of magnetic field at a point just underneath it? (b) Name the law used to arrive at the answer in part (a).