Magnetic Effects of Current and Magnetism (AIIMS Physics): Questions 42 - 44 of 49

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Question number: 42

» Magnetic Effects of Current and Magnetism » Hysteresis

MCQ▾

Question

The mass of a specimen of a ferromagnetic material is 0.6kg and its density is 7.8×103kgm3 . If the area of hysteresis loop of alternating magnetizing field of frequency 50Hz is 0.722MKS units then the hysteresis loss per second will be –

Choices

Choice (4) Response
a.

277.7×105Jsec

b.

277.7×104Jsec

c.

277.7×105Jsec

d.

277.7×103Jsec

Question number: 43

» Magnetic Effects of Current and Magnetism » Magnetic Susceptibility and Permeability

MCQ▾

Question

A rod of magnetic material having cross section 0.50cm2 is putting in 5000Am magnetizing field. Magneticflux passes through the rod is 100×106Wb . Then magnetic susceptibility and magnetization of the road is, respectively –

Choices

Choice (4) Response
a.

218,12.37×105Am

b.

317,15.85×105Am

c.

321,16.75×105Am

d.

310,14.63×105Am

Question number: 44

» Magnetic Effects of Current and Magnetism » Ampere's Law

MCQ▾

Question

A long straight wire (radius=5.0mm) carries a constant current distributed uniformly over a cross section perpendicular to the axis of the wire. If the current density is 200Am2 . The magnitudes of the magnetic field at

(a) 3.0 mm from the axis of the wire and

(b) 6.0 mm from the axis of the wire is: -

Choices

Choice (4) Response
a.

12π×108T,5π3×107T

b.

6π×108T,3π2×107T

c.

π×108T,π2×108T

d.

π×104T,5π2×107T

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