?Vibration magnetometer works on the principle of
1). torque acting on the bar magnet?
2). ?force acting on the bar magnet
3). both the force and the torque acting on?the bar magnet
4). none of these?
The core of an electromagnet is made of soft iron because soft iron has
1). small susceptibility and small retentivity
2). large susceptibility and small retentivity
3). large density and large retentivity
4). small density and large retentivity?
?When a charged particle entres a?uniform magnetic field its kinetic energy
1). Remains constant
2). ?increased?
3). Decreases
4). becomes?
The primary cell is a
1). secondary cell?
2). ?primary cell
3). both (a) and (b)?
4). ?None of these
?Good resistance coils are made of
1). ?Copper
2). manganin
3). gold?
4). silver