Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 25

EASY

JEE Main

IMPORTANT

Earn 100

A steel wire of length $l$ has a magnetic moment $M$ . It is then bent into a semicircular arc. The new magnetic moment is

56.76% studentsanswered this correctly

Important Questions on Magnetic Effects of Current and Magnetism

HARD

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 26

A current $I$ flows along a wire frame having the shape shown total of six straight wires of length L each, soldered to form two perpendicular square shapes. The magnetic moment of this wire frame is $x I L^{2} .$ The value of $x \times \sqrt{2}$ is

Question Image

EASY

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 27

Which of the following is experienced by a current carrying loop in a uniform magnetic field?

MEDIUM

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 28

A wire of length

l

, carrying current

i

, is bent in circle of radius

r

, then magnetic moment at centre of loop is

EASY

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 29

The magnetic moment of an electron orbiting in a circular orbit of radius

r

with a speed

v

is equal to

EASY

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 30

A galvanometer has current range of

15 mA

and voltage range

750 mV

. To convert this galvanometer into an ammeter of range

25 A

, the required shunt is

EASY

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 31

A

50 ohm

galvanometer gets full scale deflection when a current of

0.01 A

pass through the coil. When it is converted to a

10 A

ammeter, the shunt resistance is

EASY

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 32

On rotating the dip circle plane from true position by

60 °

, the dip becomes

\tan^{- 1} (2)

. Then the original dip at that place was

\frac{π}{n}

. Find the value of

n

.

MEDIUM

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 2>Q 33

The coercivity of a magnet is

3 \times 10^{3} A m^{- 1}

. What current (in

A m p

) should be passed through solenoid of length

10 c m

and number of turns

50

so that the magnet is demagnetised when inserted in it?