B experience a net clockwise torque.

B experiences a net force along + x axis.

B experiences a net anticlockwise torque.

B experiences a net force along - x axis.

The force acting on a current carrying wire joining two fixed points A and B in a uniform magnetic field

is independent of the shape of the wire

increases exponentially with increase in current

is inversely proportional to the magnitude of the magnetic field

is parallel to the direction of the magnetic field

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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 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 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 8

The value of angle of dip at a place on earth is

45 °

. If the horizontal component of earth's magnetic field is

5 \times 10^{- 5} T

, then the total magnetic of earth's magnetic field of earth will be

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 9

The true value of angle of dip at a place is

60 °

. The apparent dip in a plane inclined at an angle of

30 °

with magnetic meridian is

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 10

A dip needle lies initially in the magnetic meridian when it shows an angle of dip

θ

at a place. The dip circle is rotated through an angle

x

in the horizontal plane and then it shows an angle of dip

θ^{'}

. Then

\frac{\tan θ'}{\tan θ}

The variation of magnetic susceptibility (χ) with absolute temperature T for a ferromagnetic material is,

Important Questions on Magnetic Effects of Current and Magnetism

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