Home
Class 12
PHYSICS
A copper wire of radius 0.1mm and resist...

A copper wire of radius 0.1mm and resistance `1k(Omega)`is connected across a power supply of 20 V.(a)How many electrons are transferred per second between the supply and the wire at one end?(b) Write down the current density in the wire.

Text Solution

Verified by Experts

The correct Answer is:
`n=1/1.6xx10^(17)=1.25xx10^(17)`
`1/(2pi)xx10^(6)A//m^(2)`
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    RESONANCE ENGLISH|Exercise Exercise-1 (Part-2)|47 Videos

  • CURRENT ELECTRICITY

    RESONANCE ENGLISH|Exercise Exercise-1 (Part-3)|2 Videos

  • CURRENT ELECTRICITY

    RESONANCE ENGLISH|Exercise Solued miscellaneous Prolblems|8 Videos

  • COMMUNICATION SYSTEMS

    RESONANCE ENGLISH|Exercise Exercise 3|13 Videos

  • DAILY PRACTICE PROBLEM

    RESONANCE ENGLISH|Exercise DPP.No.71|1 Videos

Similar Questions

Explore conceptually related problems

A wire of length 1 m and radius 0.1mm has a resistance of 100(Omega) .Find the resistivity of the material .

How many electrons per second pass through a section of wire carrying a current of 0.7A ?

A potentiometer wire of length 10 m and resistance 30 Omega is connected in series with a battery of emf 2.5 V , internal resistance 5 Omega and an external resistance R . If the fall of potential along the potentiometer wire is 50 mu V mm^(-1) , then the value of R is found to be 23 n Omega . What is n ?

An accumulator of emf 2 V and negligible internal resistance is connected across a uniform wire of length 10 m and resistance 30 Omega The appropriate terminals of a cell of emf 1.5 V and internal resistance 1 Omega is connected to one end of the wire and the other terminal of the cell is connected through a sensitive galvanometer to a slider on the wire. What is the length of the wire that will be required to produce zero deflection of the galvanometer? How will the balancing length change? (a) When a coil of resistance 5Omega is placed in series with the accumulator. (b) The cell of 1.5 V is shunted with 5 Omega resistor?

A current of 1.0 ampere is flowing through a copper wire of length 0.1 metre and cross-section 1.0xx10^(-6) m^(2) . (i) If the specific resistance of copper be 1.7xx10^(-8) Omega m , calculate the potential difference across the ends of the wire. (ii) Determine current density in the wire. (iii) If there be one free electron per atom in copper, then determine the drift velocity of electrons. Given : density of copper =8.9xx10^(3) kg m^(-3) , atomic weight =63.5, N=6.02xx10^(26) per kg-atom.

A uniform wire of resistance 4Omega is bent into circle of radius r . As specimen of the same wire is connected along the dimeter of the circle. What is the equivalent resistance across the ends of this wire?

A 1m long wire of diameter 0.31mm has a resistance of 4.2 Omega . If it is replaced by another wire of same material of length 1.5m and diameter 0.155 mm , then the resistance of wire is

The wire of potentiometer has resistance 4 Omega and length 1m. It is connected to a cell of e.m.f. 2V and internal resistance 1 Omega . The current flowing through the potentiometer wire is

Two parallel wires PQ, RS of resistance 10Omega and 20Omega are seperated by a distance of 10 cm and connected in parallel across a cell of emf200V and negligible intemal resistance. A wire AB of mass I g and length 1 cm is balanced exactly, between them. What must be the current in it.

A copper wire has a square cross section of 6 mm on a side. The wire is 10 m long and carries a current of 3.6A. The density of free electrons id 8.5x10^(28)//m^3. Find the magnitude of (a) the current density in the wire , (b) the electric field in the wire. (c ) How much time is required for an electron to travel the length of the wire? ("rh, electrical resistivity, is" 1.72 xx10^(-8) Omegam.)

RESONANCE ENGLISH-CURRENT ELECTRICITY-Exercise-1 (Part-1)
  1. The current through a wire depends on time as I = i(0) + alphat, ...

    Text Solution

    |

  2. Estimate the average drift speed of conduction electrons in a copper w...

    Text Solution

    |

  3. A copper wire of radius 0.1mm and resistance 1k(Omega)is connected acr...

    Text Solution

    |

  4. (i) A potential difference of 200 volt is applied to a coil at a tempe...

    Text Solution

    |

  5. I-V graph for a metallie wire at two different tempearture, T(1)and T(...

    Text Solution

    |

  6. If a copper wire is stretched to make it 0.1% longer what is the perce...

    Text Solution

    |

  7. A rectangular carbon block has dimensions 1.0 cmxx 1.0 xx50 cm. (i) ...

    Text Solution

    |

  8. In following diagram boxes may contain resistor or battery or any othe...

    Text Solution

    |

  9. The figure shows the current I in a single-loop circuit with a battery...

    Text Solution

    |

  10. A car has a fresh storage battery of emt 12 V and internal resistance ...

    Text Solution

    |

  11. One kilowatt electric heater is to be used with 220V d.c. supply. (i...

    Text Solution

    |

  12. In following circuit potential at point 'A' is zero then determine ...

    Text Solution

    |

  13. For the circuit shown in figure, find the voltage acrss 10Omega resist...

    Text Solution

    |

  14. A resistor develops 400J of thermal energy in 10 s when a current of 2...

    Text Solution

    |

  15. Find the current in 10Omega resistcance, V(1) and source voltage V(s) ...

    Text Solution

    |

  16. Two electric bulbs, each designed to operate with a power of 500W in 2...

    Text Solution

    |

  17. Two (non-physics) students, A and B living in neighboring hostel room...

    Text Solution

    |

  18. All resistances in fig. 5.34 are in ohm. Find the effective resistance...

    Text Solution

    |

  19. In the given circuit determine (a) Equivalent resistance (Including...

    Text Solution

    |

  20. In given circuit determine (a) Equivalent resistance (Including int...

    Text Solution

    |