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An ionised gas contains both positive and negative ions initially at rest. If it is subjected simultaneously to an electric field along the $+ x$ direction and a magnetic field along the $+ z$ direction, then

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Important Questions on Magnetic Effects of Current

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JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>[ Level 2 ]>Q 4

Two protons are projected simultaneously from a fixed point with the same velocity

v

into a region where there exists a uniform magnetic field. The magnetic field strength at

B

and it is perpendicular to the initial direction of

v

. One proton starts at time

t = 0

and another proton at

t = \frac{π m}{2 q B}

. The separation between them at time

t = \frac{π m}{q B}

[where,

m

and

q

are the mass and charge of proton], will be approximately

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JEE Advanced

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>[ Level 2 ]>Q 5

A disc of radius

R

rotates with constant angular velocity $\omega$ about its own axis. Surface charge density of this disc varies as

σ = α r^{2}

where,

r

is the distance from the centre of disc. Determine the magnetic field intensity at the centre of disc.

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>[ Level 2 ]>Q 6

A particle of mass

m

and having a positive charge

q

is projected from the origin with speed

v_{\circ}

along the positive

x

-axis in a magnetic field

B = - B_{\circ} \hat{k}

where,

B_{\circ}

is a positive constant. If the particle passes through

(0, y, 0)

, then

y

is equal to

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JEE Advanced

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>[ Level 2 ]>Q 7

A rigid circular loop of radius

r

and mass

m

lies in the

x y

-plane on a flat table and has a current

i

flowing in it. At this particular place, the earth's magnetic field is

B = B_{x} \hat{i} + B_{z} \hat{k}

. The value of

i

so that the loop starts tilting is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>[ Level 2 ]>Q 8

Two circular coils

1

and

2

are made from the same wire but the radius of the

1^{st}

coil is twice that of the

2^{nd}

coil. What is the ratio of potential difference applied across them, so that the magnetic field at their centres is the same?

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JEE Advanced

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>[ Level 2 ]>Q 9

A circular loop of mass $m$ and radius $r$ is lying in a horizontal ( $X - Y$ plane) table as shown in figure. A uniform magnetic field $B$ is applied parallel to $x$ -axis. The current $I$ in the loop, so that its one edge just lifts from the table, is

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JEE Advanced

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>[ Level 2 ]>Q 10

A charged particle with specific charge (charge per unit mass

= \frac{q}{m} = s

) moves undeflected through a region of space containing mutually perpendicular and uniform electric and magnetic fields

E

and

B

. When the electric field

E

is switched off, the particle will move in a particular path of radius

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JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 3 - Magnetic Effects of Current>[ Level 2 ]>Q 11

A wire bent in the form of a regular polygon of $n$ sides, is inscribed in a circle of radius $a$ . If $i$ ampere is the current flowing in the wire, then the magnetic flux density (magnetic field) at the centre of the circle is

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An ionised gas contains both positive and negative ions initially at rest. If it is subjected simultaneously to an electric field along the +x direction and a magnetic field along the +z direction, then

Important Questions on Magnetic Effects of Current

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An ionised gas contains both positive and negative ions initially at rest. If it is subjected simultaneously to an electric field along the $+ x$ direction and a magnetic field along the $+ z$ direction, then