Home
Class 12
PHYSICS
A toroid of n turns, mean radius R and c...

A toroid of n turns, mean radius R and cross-sectional radius a carries current I. It is placed on a horizontal table taken as x-y plane. Its magnetic moment `vecM`

A

is non-zero and points in the z-direction by symmetry

B

points along the axis of the toroid `(vec(M)=mhatphi)`

C

is zero, otherwise there would be a field falling as `(1)/(r^(3))` at large distances outside the toroid

D

is pointing radially outwards.

Text Solution

Verified by Experts

The correct Answer is:
A
In a toroid magnetic field is only confined inside the body of toroid in the form of conentric magnetic lines of force and outside the toroid magnetic field is zero.
Promotional Banner

Topper's Solved these Questions

  • MAGNETISM AND MATTER

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

  • MAGNETISM AND MATTER

    NCERT FINGERTIPS|Exercise Higher Order Thinking Skills|8 Videos

  • ELECTROSTATIC POTENTIAL AND CAPACITANCE

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

  • MOVING CHARGES AND MAGNETISM

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

Similar Questions

Explore conceptually related problems

A circular coil of n turns and radius r carries a current I. The magnetic field at the center is

The radius of a circular loop is r and a current i is flowing in it. The equivalent magnetic moment will be

Figure shows a long straight wire of a circular cross-section (radius a) carrying steady current l. The current l is uniformly distributed across this cross-section. Calculate the magnetic field in the region r lt a and r gt a

Knowledge Check

  • A circular coil of n turns and radius r carries a current I. The magnetic field at the center is

    A
    `(mu_0nI)/(r)`
    B
    `(mu_0nI)/(2r)`
    C
    `(2mu_0nI)/(r)`
    D
    `(mu_0nI)/(4r)`

  • The radius of a circular loop is r and a current I is flowing is it. The equivalent magnetic moment will be

    A
    Ir
    B
    `2 pi Ir`
    C
    `I pi r^(2)`
    D
    `(1)/(r^(2))`

  • A toroid of mean radius 'a', cross section radius 'r' and total number of turns N. It carries a current 'I'. The torque experienced by the toroid if a uniform magnetic field of strength B is applied.

    A
    is zero
    B
    is Bi N `pir^(2)`
    C
    is B I `N pi a^(2)`
    D
    depends on the direction of magnetic field.