A charged particle carrying charge 1 μ C is moving with velocity ( 2 i ^ + 3 j ^ + 4 k ^ ) m s - 1 . If an external magnetic field of ( 5 i ^ + 3 j ^ - 6 k ^ ) × 10 - 3 T exists in the region where the particle is moving then the force on the particle is F → × 10 - 9 N . the vector F → is :

- 0 . 30 i ^ + 0 . 32 j ^ - 0 . 09 k ^

- 3 . 0 i ^ + 32 j ^ - 0 . 9 k ^

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : For measuring the potential difference across a resistance of 600 Ω , the voltmeter with resistance 1000 Ω will be preferred over voltmeter with resistance 4000 Ω . Reason R : Voltmeter with higher resistance will draw smaller current than voltmeter with lower resistance. In the light of the above statements, choose the most appropriate answer from the options given below

A is not correct but R is correct

Both A and R are correct and R is the correct explanation of A

Both A and R are correct but R is not the correct explanation of A

A is correct but R is not correct

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Magnitude of magnetic field (in SI units) at the centre of a hexagonal shape coil of side $10 cm, 50$ turns and carrying current $I$ (Ampere) in units of $\frac{μ_{0} I}{π}$ is :

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Important Questions on Magnetic Effects of Current and Magnetism

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 3 September 2020 Shift 1>Q 42

A charged particle carrying charge

1 μ C

is moving with velocity

(2 \hat{i} + 3 \hat{j} + 4 \hat{k}) m s^{- 1}

. If an external magnetic field of

(5 \hat{i} + 3 \hat{j} - 6 \hat{k}) \times 10^{- 3} T

exists in the region where the particle is moving then the force on the particle is

\vec{F} \times 10^{- 9} N

. the vector

\vec{F}

is :

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 3 September 2020 Shift 2>Q 43

A perfectly diamagnetic sphere has a small spherical cavity at its centre, which is filled with a paramagnetic substance. The whole system is placed in a uniform magnetic field $\vec{B}$ . Then the field inside the paramagnetic substance is:

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 3 September 2020 Shift 2>Q 44

A galvanometer coil has 500 turns and each turn has an average area of

3 \times 10^{- 4} m^{2}

. If a torque of

1.5 Nm

is required to keep this coil parallel to a magnetic field when a current of

0.5 A

is flowing through it, the strength of the field (in

T

) is _________ .

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 4 September 2020 Shift 1>Q 45

A small bar magnet is placed with its axis at

30^{o}

with an external magnetic field of

0.06 T

experiences a torque of

0.018 Nm

. The minimum work required to rotate it from its stable to unstable equilibrium position is:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 4 September 2020 Shift 1>Q 46

A wire $A$ , bent in the shape of an arc of a circle, carrying a current of $2 A$ and having radius $2 cm$ and another wire $B$ , also bent in the shape of an arc of a circle, carrying a current of $3 A$ and having radius of $4 cm$ , are placed as shown in the figure. The ratio of the magnetic fields due to the wires $A$ and $B$ at the common centre $O$ is:

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 4 September 2020 Shift 2>Q 47

A circular coil has moment of inertia

0.8 kg m^{2}

around any diameter and is carrying current to produce a magnetic moment of

20 A m^{2}

. The coil is kept initially in a vertical position and it can rotate freely around a horizontal diameter. When a uniform magnetic field of

4 T

is applied along the vertical, it starts rotating around its horizontal diameter. The angular speed the coil acquires after rotating by

60^{o}

will be :

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 4 September 2020 Shift 2>Q 48

A paramagnetic sample shows a net magnetisation of

6 A m^{- 1}

when it is placed in an external magnetic field of

0.4 T

at a temperature of

4 K

. When the sample is placed in an external magnetic field of

0.3 T

at a temperature of

24 K

, then the magnetisation will be :

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 5 September 2020 Shift 1>Q 49

A galvanometer of resistance

G

is converted into a voltameter of range

0 - 1 V

by connecting a resistance

R

in series with it. The additional resistance that should be connected in series with

R_{1}

to increase the range of the voltmeter to

0 - 2 V

will be :

Magnitude of magnetic field (in SI units) at the centre of a hexagonal shape coil of side 10 cm,50 turns and carrying currentI (Ampere) in units of μ0Iπ is :

Important Questions on Magnetic Effects of Current and Magnetism

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Magnitude of magnetic field (in SI units) at the centre of a hexagonal shape coil of side $10 cm, 50$ turns and carrying current $I$ (Ampere) in units of $\frac{μ_{0} I}{π}$ is :