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
Magnetic meridian is
Which of the following four graphs may best represent the current-deflection relation in a tangent galvanometer?
A tangent galvanometer is connected directly to an ideal battery. If the number of turns in the coil is doubled the deflection will
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.
Why is it not possible to make permanent magnets from paramagnetic materials?
The magnetic moment of the assumed dipole at the earth's centre is 8.0 × 1022 A m2. Calculate the magnetic field B at the geomagnetic poles of the earth. Radius of the earth is 6400 km.
The magnetic field due to the earth has a horizontal component of 26 μT at a place where the dip is 60°. Find the vertical component and the magnitude of the field.
A moving-coil galvanometer has a 50-turn coil of size 2 cm × 2 cm. It is suspended between the magnetic poles producing a magnetic field of 0.5 T. Find the torque on the coil due to the magnetic field when a current of 20 mA passes through it.
