Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 1>Q 17

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A current of $5 A$ flows through a straight wire. A magnetic compass is brought close to it. What can be said about the compass needle?
$(i)$ a substantial deflection is seen in the orientation of the needle.
$(ii)$ the needle lies in a plane that is perpendicular to the wire. Its direction is along a tangent to a circle with the straight wire at its centre.

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Important Questions on Magnetic Effects of Current and Magnetism

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IMPORTANT

Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 1>Q 18

A very long conducting wire is extended along the

Z

axis. It carries a current of

2 A

. The line integral

\int \vec{B} . d \vec{l}

is computed along a straight line

P Q

where points are give as

P (2 cm, 0, 0)

and

Q (2 cm, 2 cm, 0)

. Then the value of integral is (in

S I

units)

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 1>Q 19

Electromagnets are made of soft iron because, soft iron has

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 1>Q 20

Ampere's law is analogous to

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 1>Q 21

Two points $A$ and $B$ are situated perpendicular to the axis of $4 cm$ long bar magnet at distances $x$ and $3 x$ from its centre on opposite sides. The ratio of magnetic inductions at $A$ and $B$ will be equal to

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 1>Q 22

The magnetic field of earth at the equator is approximately

4 \times 1 0^{- 5} T

. The radius of earth is

6.4 \times 1 0^{6} m

. Then the dipole moment of the earth will be nearly of the order of :

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 1>Q 23

The magnetic field at a point X on the axis of a small bar magnet is equal to the field at a point Y on the equator of the same magnet. The ratio of the distances of point X and Y from the centre of the magnet is :-

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 1>Q 24

Which magnetic field is similar to that of a bar magnet?

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 1>Q 25

The ratio of torque acting on a magnet of magnetic moment

M

placed in a uniform magnetic field when the angle between

\vec{M}

and

\vec{B}

are

90 °

and

0 °

respectively is