A magnetising field of 1500 Am - 1 produces a magnetic flux of 2 . 4 × 10 - 5 Wb in a bar of iron of cross-section 0 . 2 × 10 - 4 m 2 . Calculate the permeability and susceptibility of the bar.

Here, H = 1500 A / m , ϕ B = 2 . 4 × 10 - 5 W b A = 0 . 2 × 10 - 4 m 2 Magnetic field, B = ϕ B A = 2 . 4 × 10 - 5 W b 0 . 2 × 10 - 4 m 2 = 1 . 2 Wb / m 2 Permeability, μ = B H = 1 . 2 Wb / m 2 1500 A / m = 8 . 67 × 10 - 4 T m A Susceptibility, χ m = μ μ 0 - 1 = 8 . 67 × 10 - 4 4 π × 10 - 7 - 1 = 689 . 67 - 1 = 688 . 67

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If a wire in the earth’s magnetic field carries a current vertically downwards , it is possible to obtain a neutral point :-

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Important Questions on Matter and Magnetism

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Beta Question Bank for Medical: Physics>Chapter 26 - Matter and Magnetism>Exercise (Analytical Questions)>Q 10

A short bar magnet was placed on the table along the north-south line. Its North Pole is directed towards geographic north then the location of neutral points is:-
(A) North
(B) South
(C) East
(D) West

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Beta Question Bank for Medical: Physics>Chapter 26 - Matter and Magnetism>Exercise (Analytical Questions)>Q 11

A short magnet of moment,

6.75 A - m^{2}

produces neutral points on its axis. If the horizontal component of the earth’s magnetic field,

5 \times 10^{- 5} Wb m^{- 2}

, then the distance of the neutral points from the center of magnet:-

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Beta Question Bank for Medical: Physics>Chapter 26 - Matter and Magnetism>Exercise (Analytical Questions)>Q 12

A straight wire carries current in a vertically upward direction. A point $‘ P ’$ lies just east of it at a small distance and another point $‘ Q ’$ lies to the west just the same distance. The magnetic field at these points:- (consider earth magnetic field).

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Beta Question Bank for Medical: Physics>Chapter 26 - Matter and Magnetism>Exercise (Analytical Questions)>Q 13

Diamagnetism is the _____ property of every material and it is generated due to mutual interaction between the applied magnetic field and orbital motion of electrons

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Beta Question Bank for Medical: Physics>Chapter 26 - Matter and Magnetism>Exercise (Analytical Questions)>Q 15

How the magnetic susceptibility (x_m) of diamagnetic, paramagnetic and feromagnetic substances depends on temperature (T).

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Beta Question Bank for Medical: Physics>Chapter 26 - Matter and Magnetism>Exercise (Analytical Questions)>Q 16

A Rowland ring has

1 0^{3}

turns per unit length. On passing a current of

2 A

, magnetic induction is measured to be

1.5 W b m^{- 2}

.
Calculate magnetic susceptibility

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Beta Question Bank for Medical: Physics>Chapter 26 - Matter and Magnetism>Exercise (Analytical Questions)>Q 17

A magnetising field of

1500 {Am}^{- 1}

produces a magnetic flux of

2.4 \times 10^{- 5} Wb

in a bar of iron of cross-section

0.2 \times 10^{- 4}

m^{2}

. Calculate the permeability and susceptibility of the bar.

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Beta Question Bank for Medical: Physics>Chapter 26 - Matter and Magnetism>Exercise (Analytical Questions)>Q 18

A uniform magnetic field gets modified as shown below, when the specimans X and Y are placed in it. Identify the two specimans X and Y

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If a wire in the earth’s magnetic field carries a current vertically downwards , it is possible to obtain a neutral point :-

Important Questions on Matter and Magnetism

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