Advertisements
Advertisements
Question
Which property of soft iron makes it useful for preparing electromagnet?
Advertisements
Solution
When a current is passed through an electromagnet's coil, it should become magnetic, but once the current is turned off, it should lose its magnetism. As a result, the ferromagnetic core (usually iron-based) used in an electromagnet should have high permeability and low retentivity, i.e. be magnetically'soft.'
APPEARS IN
RELATED QUESTIONS
State any two advantages of electromagnets over permanent magnets.
State two advantages of an electromagnet over a permanent magnet.
Write two characteristics of a material used for making permanent magnets ?
Why is the core of an electromagnet made of ferromagnetic materials?
Compare the direction of the magnetic field inside a solenoid with that of the field there if the solenoid is replaced by its equivalent combination of north pole and south pole.
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
Consider the situation of the previous problem. The directions of the magnetic field due to the dipole are opposite at
(a) P1 and P2
(b) Q1 and Q2
(c) P1 and Q1
(d) P2 and Q2
A magnetic dipole of magnetic moment `1.44 "A m"^2`is placed horizontally with the north pole pointing towards north. Find the position of the neutral point if the horizontal component of the earth's magnetic field is 18 μT.
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.
The magnetometer of the previous problem is used with the same magnet in Tan-B position. Where should the magnet be placed to produce a 37° deflection of the needle?
Soft iron is used to make the core of the transformer because of its ______.
What should be retentivity and coercivity of permanent magnet?
Assertion: Electromagnetic are made of soft iron.
Reason: Coercivity of soft iron is small.
A steel wire of length 1 has a magnetic moment m it is then bent into a semicircular arc. The new magnetic moment is
Which of the following is most suitable for the core of an electromagnet?
