Home
Class 12
PHYSICS
Two conducting wires X and Y of same dia...

Two conducting wires X and Y of same diameter but different materials are joined in series across a battery. If the number density of electrons in X is twice that in Y, find the ratio of drift velocity of electrons in the two wires.

Text Solution

Verified by Experts

Here current, l, is same in both wires. Moreover `I prop n v_d`. `thereforev_(dx)/v_dy=n_y/n_x=1/2`
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY - I AND II

    PATHFINDER|Exercise QUESTION BANK|244 Videos

Similar Questions

Explore conceptually related problems

If a current passes through a metal conducting wire of area of cross section A, the drift velocity of free electrons inside the metal is v_d=1/( n e A) , where the amount of electric charge of an electron =e and the number of free electrons per unit volume of the metal=n. The applied electric field on the wire is E=V/l , where a potential difference V exists between two points, l apart, along the length of the wire. IF R is the resistance of the wire between those two points, then the resistivity of its material is rho=(RA)/l .Besides the mobility (mu) of the free electrons inside a wire is defined as their drift velocity for a unit applied electric field. The radii of two wires ,made of two different metals are in the ratio 1:2 , The number density of free electrons in the first metal is double that in the second metal. IF the current in the first wire is 1A, then the current in the second wire producing the same drift velocity is

The lengths of two wires made of the same material are in the ratio 2 : 3 . Their diameters are equal and the fundamental of the shorter wire is one octave higher than of the longer wire. Find the ratio between the tensions in the two wires.

Two electric bulbes P and Q have their resistance in the ration of 1 : 2 . They are connected in series acrosse a battery . Find the ratio of the power dissipation in these bulbs .

An electric cell of e.m.f E is connected across a copper wire of diameter d and length l. The drift velocity of electrons in the wire is v_(d) . If the length of the wire is changed to 2l, the new drift velocity of electrons in the copper wire will be

Two copper wires have a ratio of 1:4 between their diameters. IF the same current passes through both of them, the drift velocity of the electrons will be in the ratio of

Ratio of lengths of two wires of same material is 2:3 and ratio of areas of cross section is 1 : 2 . Find the ratio of their drift velocities when:- they.are connected in series

Two wires made of same material have equal length and radius of one of them is twice that of the other. Find the ratio of their resistances.

Ratio of lengths of two wires of same material is 2:3 and ratio of areas of cross section is 1 : 2 . Find the ratio of their drift velocities when:- they are connected in parallel.

If a current passes through a metal conducting wire of area of cross section A, the drift velocity of free electrons inside the metal is v_d=1/( n e A) , where the amount of electric charge of an electron =e and the number of free electrons per unit volume of the metal=n. The applied electric field on the wire is E=V/l , where a potential difference V exists between two points, l apart, along the length of the wire. IF R is the resistance of the wire between those two points, then the resistivity of its material is rho=(RA)/l .Besides the mobility (mu) of the free electrons inside a wire is defined as their drift velocity for a unit applied electric field. The radii of two wires of the same metal are in the ratio 1:2 The same potential difference is applied between two points at a distance l on each of the wires.The ratio between the drift velocities of the free electrons in two wires is

PATHFINDER-CURRENT ELECTRICITY-QUESTION BANK
  1. Two 120 V light bulbs, one of 25 W and other of 200 W are connected in...

    Text Solution

    |

  2. A wire of resistance 8R is bent in the form of a circle. What is the e...

    Text Solution

    |

  3. Two conducting wires X and Y of same diameter but different materials ...

    Text Solution

    |

  4. V.I graph for a metalic wire at two different temperatures T1 and T2 i...

    Text Solution

    |

  5. Two cells E1 and E2 have and emf of 5V and 9V and internal resistances...

    Text Solution

    |

  6. A secondary cell after long use has an emf of 1.8 volt and a large int...

    Text Solution

    |

  7. Draw V-I graph for ohmic and non-ohmic materials, Give one example for...

    Text Solution

    |

  8. Obtain an expression showing the relation between the current-density ...

    Text Solution

    |

  9. Explain the principle on which the working of a potentiometre is base...

    Text Solution

    |

  10. The 'maximum' power rating of each resistor (2Omega) in the given circ...

    Text Solution

    |

  11. A set of n identical resistors, each of resistance R ohm when connecte...

    Text Solution

    |

  12. Two cells of e.m.f. E1 and E2 have internal resistance r1 and r2. Dedu...

    Text Solution

    |

  13. State kirchoff's rules for current distribution in an electrical netwo...

    Text Solution

    |

  14. A resistance R = 2Omega is connected to one of the gaps in a metre bri...

    Text Solution

    |

  15. The lengths and radii of there wires of same metal are in the rations ...

    Text Solution

    |

  16. State Kricholff's laws of an electrical network. Using Kirchoff's laws...

    Text Solution

    |

  17. Draw circuit diagram to compare emf of two primary cells. Derive the f...

    Text Solution

    |

  18. Which material is used for potentiometer wire and why?

    Text Solution

    |

  19. How can sensitivity of a potentiometer be increased?

    Text Solution

    |

  20. A and B are two points on a circular ring made of uniform wire of resi...

    Text Solution

    |