Advertisements
Advertisements
प्रश्न
State any two advantages of electromagnets over permanent magnets.
Advertisements
उत्तर
Following are the advantages of electromagnet over permanent magnets.
1) An electromagnet can produce a strong magnetic field
2) The strength of the magnetic field of an electromagnet can be easily changed by changing the current in its solenoid.
APPEARS IN
संबंधित प्रश्न
What are permanent magnets? Give one example ?
A tangent galvanometer is connected directly to an ideal battery. If the number of turns in the coil is doubled the deflection will
A uniform magnetic field of `0.20 xx 10^-3 "T"` exists in the space. Find the change in the magnetic scalar potential as one moves through 50 cm along the field.
Figure shows some of the equipotential surfaces of the magnetic scalar potential. Find the magnetic field B at a point in the region.
A bar magnet has a length of 8 cm. The magnetic field at a point at a distance 3 cm from the centre in the broadside-on position is found to be `4 xx 10^-6 "T"`.Find the pole strength of the magnet.
The needle of a dip circle shows an apparent dip of 45° in a particular position and 53° when the circle is rotated through 90°. Find the true dip.
A short magnet makes 40 oscillations per minute when used in an oscillation magnetometer at a place where the earth's horizontal magnetic field is 25 μT. Another short magnet of magnetic moment 1.6 A m2 is placed 20 cm east of the oscillating magnet. Find the new frequency of oscillation if the magnet has its north pole (a) towards north and (b) towards south.
Soft iron is used to make the core of the transformer because of its ______.
Which property of soft iron makes it useful for preparing electromagnet?
What should be retentivity and coercivity of permanent magnet?
