Magnetic effect of current practice · Medium

When a charged particle enters uniform
magnetic field its kinetic energy

A straight wire carries a current of $3 \mathrm{~A}$. Calculate the magnitude of the magnetic field at a point $10 \mathrm{~cm}$ away from the wire.

A charged particle enters a uniform magnetic
field with a certain speed at right angles to it.
In the magnetic field a change could occur in
its

A very long conductor carries a current of 1 A. The magnetic field at a point whose distance is $0.1 \mathrm{~m}$ from one end of the conductor is (in ' $T$ ')

A solenoid is $2.0 \mathrm{~m}$ long and $3.0 \mathrm{~cm}$ in diameter. It has 5 layers of winding of 1000 turns each and carries a current of $5.0 \mathrm{~A}$. What is the magnetic field at the centre? Use the standard value of $\mu_0$.

A current carrying loop lies on a smooth horizontal plane. Then,

Assertion (A): The range of given voltmeter can be both increased and decreased.

Reason (R): By adjusting the value of resistance in series with galvanometer the range of voltmeter can be adjusted.

A negatively charged particle projected
towards east is deflected towards north by a
magnetic filed. The field may be:

The formula for magnetic field of a certain component is given by $B=\frac{\mu_0 N i}{2 \pi r}$

Where, $\mathbf{N}=$ total number of turns
$i=$ current through it
${r}=$ radius.

The component is

An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true?

An electron having kinetic energy $10 \mathrm{eV}$ is circulating in a path of radius $0.1 \mathrm{~m}$ in an external magnetic field of intensity $10^{-4} \mathrm{~T}$. The speed of the electron will be

Two beams of electrons are moving parallel to each other then magnetic force acting between them is

A circular coil of diameter $7 {~cm}$ has 24 turns of wire carrying current of $0.75 {~A}$. The magnetic moment of the coil is

The force on a conductor of length $l$ placed in a magnetic field of magnitude $B$ and carrying a current $i$ is given by ( $\theta$ is the angle, the conductor makes with the direction of $B$ ) :

A proton and an $\alpha \mathrm{ - }$ particle (with their masses in the ratio of 1 : 4 and charges in the ratio of 1 : 2) are accelerated from rest through a potential difference V. If a uniform magnetic field B is set up perpendicular to their velocities, the ratio of the radii ${r_p}:{r_\alpha }$ of the circular paths described by them will be

A charged particle moves through a magnetic
field in a direction perpendicular to it. Then the

The frequency of the charged particle circular at right angles to a uniform magnetic field does not depend upon the

In a chamber, a uniform magnetic field of $6.5\,\mathrm{G}(1\,\mathrm{G}=$ $10^{-4} \mathrm{~T}$ ) is maintained. An electron is shot into the field with a speed of $4.8 \times 10^6 \mathrm{~ms}^{-1}$ normal to the field. Explain why the path of the electron is a circle. Determine the radius of the circular orbit. Given that $e=1.6 \times 10^{-19} \mathrm{C},\quad m_e=9.1 \times 10^{-31} \mathrm{~kg}$.

Biot-Savart law indicates that the moving electrons (velocity ${v}$ ) produce a magnetic field ${B}$ such that

In order to increase the sensitivity of galvanometer

A galvanometer coil has a resistance of $10 \Omega$ and the ammeter shows full scale deflection for a current of $1 {~mA}$. The shunt resistance required to convert the galvanometer into an ammeter of range $0.100 {~mA}$ is about

The intensity of magnetic field due to current I in a long straight wire is proportional to

Two particles having same charge and KE enter at right angles into the same magnetic field and travel in circular paths of radii 2 cm and 3 cm respectively. The ratio of their masses is

A proton and an alpha particle both enter a region of uniform magnetic field $\mathrm{B}$, moving at right angles to the field $\mathrm{B}$. If the radius of circular orbits for both the particles is equal and the kinetic energy acquired by proton is $\mathrm{1}\,\mathrm{MeV}$, the energy acquired by the alpha particle will be:

When a current carrying conductor is placed in magnetic field,then:

A charge moving with velocity v in x-direction
is subjected to a field of magnetic induction in
negative x-direction. As a result, the charge will

A thin circular disc of radius $R$ is uniformly charged with density $\sigma$. It rotates about its diameter with angular speed $\omega$. The magnetic moment of the disc is

The angle made by orbital angular momentum of electron with the direction of the orbital magnetic moment is

The direction of magnetic field at a point due
to an infinitely long wire carrying current is :

Two long and parallel straight wires $A$ and $B$ carrying current $5 \mathrm{~A}$ each in same direction. If the force on a $5 \mathrm{~cm}$ section of wire $B$ is $5 \times 10^{-6}$ $\mathrm{N}$, then the separation between two wires is ( $\mu_0=4 \pi \times 10^{-7}$ SI unit)