Home
Class 12
PHYSICS
A uniform conducting rectangular loop of...

A uniform conducting rectangular loop of sides l, b and mass m carrying current i is hanging horizontally with the help of two vertical strings. There exists a uniform horizontal magnetic field B which is parallel to the longer side of loop. The value of tension which is least is

A

`(mg-Bb)/2`

B

`(mg+Bb)/2`

C

`(mg-2iBb)/2`

D

`(mg+2Bb)/2`

Text Solution

Verified by Experts

The correct Answer is:
c
Taking moments about point B to be zero.

`T_1l+iblB=mgl/2, T_1=(mg-2ibB)/2`
Promotional Banner

Topper's Solved these Questions

  • MAGNETIC FIELD AND MAGNETIC FORCES

    CENGAGE PHYSICS|Exercise Exercises Multiple Correct|25 Videos

  • MAGNETIC FIELD AND MAGNETIC FORCES

    CENGAGE PHYSICS|Exercise Exercises Assertion -reasoning|8 Videos

  • MAGNETIC FIELD AND MAGNETIC FORCES

    CENGAGE PHYSICS|Exercise Exercises Subjective|10 Videos

  • KINETIC THEORY

    CENGAGE PHYSICS|Exercise Question Bank|31 Videos

  • Magnetism and Matter

    CENGAGE PHYSICS|Exercise Question Bank|50 Videos

Similar Questions

Explore conceptually related problems

A wires PQRS carrying a current I runs along three edges of a cube of side l as shown in figure. There exists a uniform magnetic field of magnitude B along one of the sides of cube. The magnitude of the force acting on the wire is

A square loop of side a carris a current I . The magnetic field at the centre of the loop is

A rectangular loop of sides 20 cm and 10 cm carries a current of 5.0 A . A uniform magnetic field of magnitude 2 T exists parallel to the longer side of the loop. The torque acting on the loop is

A square conducting loop of side length L carries a current I.The magnetic field at the centre of the loop is

A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field B such that B is parallel to the plane of the loop. The magnetic torque acting on the loop is-

A loop PQR carries a current i = 2A as shown in the figure. A uniform magnetic field B = 2T exists in space parallel to the plane of the loop . The magnetic torque on the loop is

A rectangular loop of sides 20 cm and 10 cm carries a current of 5.0 A. A uniform magnetic field of magnituded 0.20 T exists parallel ot the longer side of the loop (a) What is the force acting on the loop? (b) what is the torque acting on the loop?

A rectangular loop of dimensions (axxb) carries a current i. A uniform magnetic field vec(B)=B_(0) hat(i) exists in space. Then :

CENGAGE PHYSICS-MAGNETIC FIELD AND MAGNETIC FORCES-Exercises Single Correct
  1. Figure. shows a conducting loop ABCDA placed in a uniform magnetic fie...

    Text Solution

    |

  2. A small block of mass m, having charge q, is placed on a frictionless ...

    Text Solution

    |

  3. A uniform conducting rectangular loop of sides l, b and mass m carryin...

    Text Solution

    |

  4. A particle of specific charge q/m = pi C kg^-1 is projected from the o...

    Text Solution

    |

  5. In Fig. there is a uniform conducting structure in which each small sq...

    Text Solution

    |

  6. A charged particle moves insides a pipe which is bent as shown in Fig....

    Text Solution

    |

  7. Consider a hypothetic spherical body. The body is cut into two parts a...

    Text Solution

    |

  8. An electron and a proton each travel with equal speeds around circular...

    Text Solution

    |

  9. In a region of space, a uniform magnetic field B exists in the x-direc...

    Text Solution

    |

  10. If a charged particle of charge to mass ratio (q/m) = alpha centers in...

    Text Solution

    |

  11. A conducting ring of mass 2kg and radius 0.5m is placed on a smooth pl...

    Text Solution

    |

  12. Figure shows an equilateral triangle ABC of side l carrying currents a...

    Text Solution

    |

  13. There exist uniform magnetic and electric fields of magnitudes 1T and ...

    Text Solution

    |

  14. A uniform magnetic field exist in a region which forms an equilateral ...

    Text Solution

    |

  15. A particle of positive charge q and mass m enters with velocity Vhati ...

    Text Solution

    |

  16. In the plane mirror, the coordinates of image of a charged particle (i...

    Text Solution

    |

  17. A uniform magnetic field of 1.5T exists in a cylindrical region of rad...

    Text Solution

    |

  18. An insulating rod of length I carries a charge q distrubuted uniformly...

    Text Solution

    |

  19. Two straight segments of wire ab and bc each carrying current I, are p...

    Text Solution

    |

  20. A current carrying loop is placed in the non-uniform magnetic field wh...

    Text Solution

    |