Home
Class 12
PHYSICS
A metal rod of resistance 20 Omega is fi...

A metal rod of resistance `20 Omega` is fixed along a diameter of a conducting ring of radius `0.1 m` and lies on `x-y` plane. There is a magnetic field `vec(B) = (50 T)vec(k)`. The ring rotates with an angular velocity `omega = 20rad s^(-1)` about its axis. An external resistance of `10 Omega` is connected across the center of the ring and rim. The current external resistance is

A

`1/4A`

B

`1/2A`

C

`1/3A`

D

zero

Text Solution

Verified by Experts

The correct Answer is:
C
`(BomegaR^(2))/2=10 i/2+10 i rArr ((50)(20)(0.1)^(2))/2=(30i)/2 i=1/3A`
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION

    RESONANCE|Exercise Exercis-2 PART 2|17 Videos

  • ELECTROMAGNETIC INDUCTION

    RESONANCE|Exercise Exercis-2 PART 3|10 Videos

  • ELECTROMAGNETIC INDUCTION

    RESONANCE|Exercise Exercis-1 PART 2|51 Videos

  • ELECTRODYNAMICS

    RESONANCE|Exercise Advanced level problems|31 Videos

  • ELECTROSTATICS

    RESONANCE|Exercise HLP|39 Videos

Similar Questions

Explore conceptually related problems

A metal rod of resistance R is fixed along a diameter o fa conducting ring of radius r . There is a magnetic field of magnitude B perpendicular to the plane of the loop. The ring spins with an angular velocity omega about its axis. The centre of the ring is joined to its rim by an external wire W . The ring and W have no resistance. The current in W is

A conducting ring of radius l m kept in a uniform magnetic field B of 0.01 T, rotates uniformly with an angular velocity 100 rad s^(–1) with its axis of rotation perpendicular to B. The maximum induced emf in it is

A conducting ring of radius r having charge q is rotating with angular velocity omega about its axes. Find the magnetic field at the centre of the ring.

A ring rotates with angular velocity omega about an axis perpendicular to the plane of the ring passing through the center of the ring.A constant magnetic field B exists parallel to the axis.Find the emf induced in the ring.

A ring rotates with angular velocity omega about an axis perpendicula to the plane of the ring passing through the center of the ring (Fig. 3.77). A constant magnetic field B exists parallel to the axis. Find the emf induced in the ring.

A horizontal ring of radius r spins about its axis with an angular velocity omega in a uniform vertical magnetic field of magnitude B . The emf induced in the ring is

A thin uniformly charged ring of radius a = 10 cm rotates about its axsi with an angluaar velocity omega = 100 rad//s . Find the ratio of volume energy densities of magnetic and electric fields on the axis of the ring at a point removed from its centre by a distance l = a