Advertisements
Advertisements
Question
A permanent magnet in the shape of a thin cylinder of length 10 cm has M = 106 A/m. Calculate the magnetisation current IM.
Advertisements
Solution
According to the problem, M (intensity of magnetisation) = 106 A/m.
`l`(length) = 10 cm = 10 × 10–2 m = 0.1 m
And IM = magnetisation current
Here we know that M = `I_M/l`
⇒ IM = M x `l`
= 106 × 0.1 = 105 A
Important point: Here, M = Intensity of magnetisation as its units are given as A/m.
APPEARS IN
RELATED QUESTIONS
Distinguish between diamagnetic and paramagnetic substances.
A tangent galvanometer shows a deflection of 45° when 10 mA of current is passed through it. If the horizontal component of the earth's magnetic field is `B_H = 3.6 xx 10^-5 "T"` and radius of the coil is 10 cm, find the number of turns in the coil.
The magnetic susceptibility of platinum is 0.0001. It's relative permeability is:
Two substances A and B have their relative permeability slightly greater and slightly less than 1 respectively. What do you conclude about A and B as far as their magnetic materials are concerned?
Answer the following question.
Write three points of differences between para-, dia- and ferromagnetic materials, giving one example for each.
What happens to a ferromagnetic material when its temperature increases above curie temperature?
The product of magnetic susceptibility (`chi`) and absolute temperature (T) is constant for a ____________.
The earth’s field departs from its dipole shape substantially at large distances (greater than about 30,000 km). What agencies may be responsible for this distortion?
Explain qualitatively on the basis of domain picture the irreversibility in the magnetisation curve of a ferromagnet.
What kind of ferromagnetic material is used for coating magnetic tapes in a cassette player, or for building ‘memory stores’ in a modern computer?
The given figure represents a material which is ______.
Metals getting magnetised by orientation of atomic magnetic moments in external magnetic field are called ______.
Magnetic susceptibility for a paramagnetic and diamagnetic materials is respectively ______.
State the dimensions of magnetization.
Explain the Domain theory in brief.
Match List-I with List-II.
| List-I (Material) | List-II (Susceptibility) | ||
| A. | Diamagnetic | I. | χ = 0 |
| B. | Ferromagnetic | II. | 0 > χ ≥ −1 |
| C. | Paramagnetic | III. | χ >> 1 |
| D. | Non-magnetic | IV. | 0 < χ < ε |
Choose the correct answer from the options given below:
