Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 82

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If $X$ is the magnetic susceptibility and $T$ is the Curie's temperature. Then, the correct curve between $X$ and $\frac{1}{T}$ for a paramagnetic material is:

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Important Questions on Magnetic Effects of Current and Magnetism

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 83

On placing a piece of ferromagnetic material of cross-sectional area

1 {cm}^{2}

in a magnetic field of

200 oersted

, a flux density of

3000 G

is produced in it. The values of relative permeability and magnetic susceptibility of the material will, respectively, be:

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 84

For substances, hysteresis

(B - H)

curves are given as shown in figure. For making a temporary magnet, which of the following is the best?

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 85

The variation of magnetic susceptibility

(χ)

with absolute temperature

T

for a ferromagnetic material is,

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 86

The relative permeability $(μ_{r})$ of a ferromagnetic substance varies with temperature $(T)$ according to the curve,

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 1

Biot-Savart law indicates that the moving electrons (velocity

v

) produce a magnetic field

B

such that:

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 2

The magnetic field due to current carrying circular loop of the radius

12 c m

at its centre is

0.50 \times 1 0^{- 4} T

. The magnetic field due to this loop at a point on the axis at a distance of

5 c m

from the centre is

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 3

An electron moves in a circular orbit with a uniform speed

v

. It produces a magnetic field

B

at the centre of the circle. The radius of the circle is proportional to,

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 4

A proton is found to be accelerating on a cyclotron which has an oscillating frequency of

11 MHz

in an external magnetic field of

1 T

. It is given that the radius of its dees is

55 cm

. What is its kinetic energy (in

MeV

)? (

m_{p} = 1.67 \times 10^{- 27} k g, e = 1.6 \times 10^{- 19} C

)