Home
Class 12
PHYSICS
AB and CD are fixed conducting smooth ra...

`AB` and `CD` are fixed conducting smooth rails placed in a vertical plane and joined by a constant current source at its upper end. `PQ` is a conducting rod which is free to slide on the rails. A horizontal uniform magnetic field exists in space as shown in figure. If the rod `PQ` is released from rest then,

A

The rod `PQ` may move downward with constant acceleration

B

The rod `PQ` may move upward with constant acceleration

C

The rod will move downward with decreasing acceleration and finally acquire a constant speed

D

either `A` and `B`

Text Solution

Verified by Experts

The correct Answer is:
D
It the magnitude of `l_(A)` is very large such that force due to magnetic field on `PQ` exceeds its weight then it will move upwards otherwise it will move downwards.
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION

    RESONANCE|Exercise Exercis-2 PART 1|15 Videos

  • ELECTROMAGNETIC INDUCTION

    RESONANCE|Exercise Exercis-2 PART 2|17 Videos

  • ELECTROMAGNETIC INDUCTION

    RESONANCE|Exercise Exercis-1|63 Videos

  • ELECTRODYNAMICS

    RESONANCE|Exercise Advanced level problems|31 Videos

  • ELECTROSTATICS

    RESONANCE|Exercise HLP|39 Videos

Similar Questions

Explore conceptually related problems

AB and CD are fixed conducting smooth rails placed in a vertical palne and joined by a constant current source at its upper end. PQ is a conducting rod which is free to slide on the rails. A horizontal uniform magnetic field exists in space as shwn in figure. If the rod PQ is released from rest then,

A pair of long conducting rails are held vertical at a separation l = 50 cm . The top ends are connected by a resistance of R = 0.5 Omega and a fuse (F) of negligible resistance. A conducting rod is free to slide along the rails under gravity. The whole system is in a uniform horizontal magnetic field B = 1.5 T as shown. Resistance of the rod and rails are negligible and the rod remains horizontal as it moves. The rod is released from rest. Find the minimum mass of the rod that will ensure that the fuse blows out. It is known that rating of the fuse is 4 A.

Two long parallel horizontal rails a, a distance d aprt and each having a risistance lambda per unit length are joing at one end by a resistance R. A perfectly conduction rod MN of mass m is free to slide along the rails without friction (see figure). There is a uniform magnetic field of induction B normal to the plane of the paper and directed into the paper. A variable force F is applied to the rod MN such that, as the rod moves a constant current flows through R. (i) Find the velocity of the rod and the applied force F as function of the distance x of the rod from R. (ii) What fraction of the work done per second by F is converted into heat?

Statement I: A resistance R is connected between the two ends of the parallel smooth conducting rails. A conducting rod lies on these fixed horizontal rails and a uniform constant magnetic field B exists perpendicular to the plane of the rails as shown in Fig. if the rod is given a velocity upsilon and released as shown in Fig. 3.188, it will stop after some time. the total work done by magnetic field negative. Statement II: If force acts opposite to direction of velocity its work done is negative.

A resistance R is connected between the two ends of the parallel smooth conducting rails.A conducting rod lies on these fixed horizontal rails and a uniform constant magnetic field B exists perpendicular to the plane of the rails as shown in the figure.If the rod is given a velocity v and released as shown in figure, it will stop after some time, which option are correct:

On an inclined plane, two conducting rails are fixed along the line of greatest slope. A conducting rod AB is placed on the radils so that it is horizontal. A vertically upward uniform magnetic field is present in the region. A current i flows through AB from B to A. The mass of AB is m and the coefficient of friction between the rod and rails is mu . Find the minimum and maximum value of B, so that the rod can stay in equilibrium. Assume that mu lt tan theta

Two idential conductors P and Q are placed on two frictionless rails R and S in a uniform magnetic field directed into the plane. If P is moved in the direction shown in figure with a constant speed, then rod Q

A wire is bent in the form of a V shape and placed in a horizontal plane.There exists a uniform magnetic field B perpendicular to the plane of the wire. A uniform conducting rod starts sliding over the V shaped wire with a constant speed v as shown in the figure. If the wire no resistance, the current in rod wil

A metal rod of length l pivoted at is upper end. It is released from a horizontal position. There is a uniform magnetic field _|_ to its plane of rotation. When it becomes vertical, the p.d. across its ends is proportional to

RESONANCE-ELECTROMAGNETIC INDUCTION-Exercis-1 PART 2
  1. A conducting rod of length is moved at constant velocity v(0) on two p...

    Text Solution

    |

  2. Figures shows a square loop of side 1m and resistance 1Omega. The magn...

    Text Solution

    |

  3. AB and CD are fixed conducting smooth rails placed in a vertical plane...

    Text Solution

    |

  4. Fig. shows a conducting loop being pulled out of a magnetic field with...

    Text Solution

    |

  5. For the situation shown in the figure, flux through the square loop is...

    Text Solution

    |

  6. A infinitely long conductor AB lies along the axis of a circular loop ...

    Text Solution

    |

  7. A rod of length l rotates with a uniform angular velocity omega about ...

    Text Solution

    |

  8. A rod of length 10 cm made up of conducting and non-conducting materia...

    Text Solution

    |

  9. a semicircle wire of radius R is rotated with constant angular velocit...

    Text Solution

    |

  10. shows a conducting disc rotating about its axis in a perpendicular ma...

    Text Solution

    |

  11. Two identical conducting rings A and B of radius R are rolling over a ...

    Text Solution

    |

  12. A cylindrical space of radius R is filled with a uniform magnetic indu...

    Text Solution

    |

  13. In a cylindrical region uniform magnetic field which is perpendicular ...

    Text Solution

    |

  14. A uniform magnetic field of induction B is confined to a cyclindrical ...

    Text Solution

    |

  15. A wire of fixed length is wound on a solenoid of length l and radius r...

    Text Solution

    |

  16. Two inductors L(1) and L(2) are connected in parallel and a time varyi...

    Text Solution

    |

  17. In an LR circuit, current at t = 0 is 20 A. After 2 s it reduces to 18...

    Text Solution

    |

  18. In the given circuit, let i(1) be the current drawn battery at time t=...

    Text Solution

    |

  19. In a series L-R growth circuit, if maximum current and maximum voltage...

    Text Solution

    |

  20. A solenoid having an iron core has its terminals connected across an i...

    Text Solution

    |