A current carrying square loop is placed near a straight infinitely long current carrying wire as shown in figure. The torque acting on the loop is

μ 0 2 π i 1 i 2 l a ( a + b )

μ 0 2 π i 1 i 2 i ( b - a ) a b

E M B I B E

Physics Crash Course NDA & NA EE>Chapter 19 - Magnetic Effect of Current and Magnetism>Exercise 1>Q 21

EASY

NDA & NA EE

IMPORTANT

Earn 100

A toroid has $500$ turns per unit length. If it carries a current of $2 A$ , the magnetic energy density inside the toroid is

50% studentsanswered this correctly

Important Questions on Magnetic Effect of Current and Magnetism

EASY

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 19 - Magnetic Effect of Current and Magnetism>Exercise 1>Q 22

The magnetic moment of electron due to orbital motion is proportional to (

n

= principal quantum numbers)

EASY

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 19 - Magnetic Effect of Current and Magnetism>Exercise 1>Q 23

A square loop is carrying a steady current

I

and the magnitude of its magnetic dipole moment is

m

. If this square loop is changed to a circular loop and it carries the same current, the magnitude of the magnetic dipole moment of circular loop will be:

EASY

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 19 - Magnetic Effect of Current and Magnetism>Exercise 1>Q 24

The ratio of angular momentum

L

to the atomic dipole moment

μ_{i}

for hydrogen like atoms and ions is

EASY

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 19 - Magnetic Effect of Current and Magnetism>Exercise 1>Q 25

Torque acting on a rectangular coil carrying current

i

situated parallel to magnetic field of induction

B

, having the number of turns

n

and area

A

is

EASY

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 19 - Magnetic Effect of Current and Magnetism>Exercise 1>Q 26

The ratio of the magnetic field at the centre of a current-carrying circular coil to magnetic moment is $x$ . If the current and the radius both are doubled. The new ratio will become

EASY

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 19 - Magnetic Effect of Current and Magnetism>Exercise 1>Q 27

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

EASY

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 19 - Magnetic Effect of Current and Magnetism>Exercise 1>Q 28

A bar magnet of the magnetic moment $P$ is placed in a uniform magnetic field $B$ , in the direction perpendicular to the field (i.e., an axis of the magnet makes an angle of