Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
Given :
Horizontal component of Earth's magnetic field,`B_H = 3.6 xx 10^-5 "T"`
Deflection shown by the tangent galvanometer, `θ = 45^circ`
Current through the galvanometer, `l = 10 "mA" = 10^-2 "A"`
Radius of the coil, r = `10 "cm" = 0.1 "m"`
Number of turns in the coil, n = ?
We know ,
`B_H tan θ = (u_0 In)/(2r)`
⇒ `n = (B_H tan \ θ xx 2r)/(u_0I)`
⇒ `n = (3.6 xx 10^-5 xx 2 xx 1 xx 10^-1)/(4pi xx 10^-7 xx 10^-2)`
⇒ `n = 0.57332 xx 10^3 = 573`
APPEARS IN
संबंधित प्रश्न
An iron rod of the area of cross-section 0.1m2 is subjected to a magnetizing field of 1000 A/m. Calculate the magnetic permeability of the iron rod. [Magnetic susceptibility of iron = 59.9, magnetic permeability of vacuum = 4π x 10-7 S. I. unit]
In what way is the behaviour of a diamagnetic material different from that of a paramagnetic, when kept in an external magnetic field?
Distinguish between diamagnetic and paramagnetic substances.
A meter gauge train is heading north with speed 54 km/hr in earth's magnetic field 3 x 10-4T. The e.m.f. induced across the axle joining the wheels is ..........
(a) 0.45 mV
(b) 4.5 mV
(c) 45 mV
(d) 450 m V
Explain Curie’s law for a paramagnetic substance.
Answer the following question.
Write three points of differences between para-, dia- and ferromagnetic materials, giving one example for each.
Which of the following statements is correct for diamagnetic materials?
Answer in brief.
Discuss the Curie law for paramagnetic material.
Why is diamagnetism, in contrast, almost independent of temperature?
Magnetic field lines are always nearly normal to the surface of a ferromagnet at every point. (This fact is analogous to the static electric field lines being normal to the surface of a conductor at every point.) Why?
Would the maximum possible magnetisation of a paramagnetic sample be of the same order of magnitude as the magnetisation of a ferromagnet?
Explain qualitatively on the basis of domain picture the irreversibility in the magnetisation curve of a ferromagnet.
Metals getting magnetised by orientation of atomic magnetic moments in external magnetic field are called ______.
A permanent magnet in the shape of a thin cylinder of length 10 cm has M = 106 A/m. Calculate the magnetisation current IM.
Which of the following cannot modify an external magnetic field as shown in the figure?
What is the susceptibility of paramagnetic substances?
Which list contains only examples of ferromagnetic substances?
