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 ^

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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A particle of mass $m$ and charge $q$ has an initial velocity $\vec{v} = v_{0} \hat{j}$ . If an electric field $\vec{E} = E_{0} \hat{i}$ and magnetic field $\vec{B} = B_{0} \hat{i}$ act on the particle, its speed will double after a time

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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 39

A beam of protons with speed

4 \times 10^{5} m s^{- 1}

enters a uniform magnetic field of

0.3 T

at an angle

60 °

to the magnetic field, the pitch of the resulting helical path of protons is close to : (Mass of the proton

= 1.67 \times 10^{- 27} kg

, charge of the proton

= 1.69 \times 10^{- 19} C

)

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 40

A particle of charge

q

and mass

m

is moving with a velocity

- v \hat{i} (v \neq 0)

towards a large screen placed in the

Y - Z

plane at distance d. If there is magnetic field

\vec{B} = B_{0} \hat{k},

the minimum value of

v

for which the particle will not hit the screen is :

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 41

The figure shows a region of length ' $l$ ' with a uniform magnetic field of $0.3 T$ in it and a proton entering the region with velocity $4 \times 10^{5} m s^{- 1}$ making an angle $60 °$ with the field. If the proton completes $10$ revolution by the time it cross the region shown, ' $l$ ' is close to (mass of proton $= 1.67 \times 10^{- 27} kg$ , charge of the proton $= 1.6 \times 10^{- 19} C$ )

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>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 :

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 43

A square loop of side

2 a,

and carrying current

I

is kept in

X Z

plane with its centre at origin. A long wire carrying the same current

I

is placed parallel to the

z

-axis and passing through the point

(0, b, 0), (b > > a)

. The magnitude of the torque on the loop about

z

-axis is given by.

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 44

A conducting circular loop of radius

r

carries a constant current

i .

It is placed in a uniform magnetic field

{\vec{B}}_{0}

such that

{\vec{B}}_{0}

is perpendicular to the plane of the loop. The magnetic force acting on the loop is

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 45

A conducting circular loop of radius

r

carries a constant current

i .

It is placed in an uniform magnetic field

{\vec{B}}_{0}

such that

{\vec{B}}_{0}

is perpendicular to the plane of the loop. The magnetic force acting on the loop is.

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 46

Two long wires with no contact are placed perpendicular to each other.

i,

and

i_{2},

are currents flowing through these wires respectively. The magnetic force on a small length

' d'

of the second wire situated at a distance

' l'

from, the first wire is proportional to,

A particle of mass m and charge q has an initial velocity v→=v0j^ . If an electric field E→=E0i^ and magnetic field B→=B0i^ act on the particle, its speed will double after a time

Important Questions on Magnetic Effects of Current and Magnetism

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A particle of mass $m$ and charge $q$ has an initial velocity $\vec{v} = v_{0} \hat{j}$ . If an electric field $\vec{E} = E_{0} \hat{i}$ and magnetic field $\vec{B} = B_{0} \hat{i}$ act on the particle, its speed will double after a time