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

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The variation of magnetic susceptibility $(χ)$ with absolute temperature $T$ for a ferromagnetic 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 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

)

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 5

Select the correct statement from the following:

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 6

In a vibration magnetometer, the time period of a bar magnet oscillating in horizontal component of earth's magnetic field is

2 s

. When a magnet is brought near such that the magnetic field is parallel to it, the time period reduces to

1 s

. The ratio

\frac{H}{F}

of the horizontal component

H

and the field

F

due to magnet will be

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 7

The horizontal component of earth's magnetic field at any place is

0.3 \times 10^{- 4} Wb m^{- 2}

. If the angle of dip at that place is

60 °

, then the value of vertical component of earth's magnetic field (in

Wb m^{- 2}

) will be