Home
Class 12
PHYSICS
Consider a current carryiing wire (curre...

Consider a current carryiing wire (current I) in the shape of a circle

A

source of emf

B

electric field produced by charges accumulated on the surface of wire

C

the charges just behind a given segment of wire which push them just the right way by repulsion

D

The charges ahead.

Text Solution

Verified by Experts

The correct Answer is:
B
Current per unit area (taken normal to the current( I/A, is called current density and is denoted by j. the SI units of the current density are `A//m^(2)`. The current density is also directed along E and is also a vector and the relationship is given by
`j=sE`
The j changes due to electric field produced by charges accumulated on the surface of wire.
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    NCERT EXEMPLAR ENGLISH|Exercise MCQs (More than one options)|5 Videos

  • CURRENT ELECTRICITY

    NCERT EXEMPLAR ENGLISH|Exercise Very Short Answer Type Question.|20 Videos

  • COMMUNICATION SYSTEM

    NCERT EXEMPLAR ENGLISH|Exercise LONG ANSWER TYPE QUESTIONS|5 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    NCERT EXEMPLAR ENGLISH|Exercise LONG ANSWER TYPE QUESTION|5 Videos

Similar Questions

Explore conceptually related problems

Consider a current carrying wire (current I) in the shape of a circle. Note that as the current progresses along the wire, the direction of vecJ (current density) changes in an exact manner, while the current I remains unaffected. The agent that is essentially responsible for is

Consider a current carrying wire (current I) in the shape of a circle. Note that as the current progresses along the wire, the direction of vecJ (current density) changes in an exact manner, while the current I remains unaffected. The agent that is essentially responsible for is

The figure shows a long straigh wire carryhing a current I_1 along the axis of a circular ring carrying a current I_2 . Identify the correct statement.

A current carrying wire is bent in the L shapes as shown in figure. The length of both arms extend to infinity. Then, the magnetic field at O is-

Find the magnetic induction at point O, if the current carrying wire is in the shape shown in the figure.

Find the current in each wire

Find the current in each wire

A current carrying wire produces in the neighbourhood

A circular loop of radius r carries a current i. How should a long, straight wire carrying a current 4i be placed in the plane of the circle so that the magnetic field at the center becomes zero?

A circular loop of radius r carries a current i. where should a long , straight wire carrying a current 4i be placed in the plane of the circle so that the magnetic field at the centre becomes zero?

NCERT EXEMPLAR ENGLISH-CURRENT ELECTRICITY-Very Short Answer Type Question.
  1. Consider a current carryiing wire (current I) in the shape of a circle

    Text Solution

    |

  2. Is the motion of a charge across junction momentum conserving ? Why or...

    Text Solution

    |

  3. The relaxation time tau is nearly independent of applied electric fiel...

    Text Solution

    |

  4. What are the advantages of the nll-point method in a Wheatstone bridge...

    Text Solution

    |

  5. What is the advantages of using thick metallic strips to join wires in...

    Text Solution

    |

  6. For wiring in the home, one uses Cu wires or A1 wires. What considerat...

    Text Solution

    |

  7. Why are alloys used for making standard resistance coils?

    Text Solution

    |

  8. Power P is to be delivered to a device via transmission cables having ...

    Text Solution

    |

  9. AB is a potentiometer wire Fig. If the value of R is increased, in whi...

    Text Solution

    |

  10. While doing an experiment with potentiometer (figure) it was found tha...

    Text Solution

    |

  11. A cell of emf E and internal resistance r is connected across an exter...

    Text Solution

    |

  12. First a set of n equal resistors of R each are connected in series to ...

    Text Solution

    |

  13. Let there be n resistors R(1) . . . R(n) with R(max)=max(R(1) . . ....

    Text Solution

    |

  14. The circuit in Fig. shows two cells connected in opposition to each o...

    Text Solution

    |

  15. Two cells of same emf E but internal resistance r(1) and r(2) are conn...

    Text Solution

    |

  16. Two conductors are made of the same material and have the same length....

    Text Solution

    |

  17. Suppose there is a circuit consister of only resistance and batteries ...

    Text Solution

    |

  18. Two cells of voltage 10Vand 2 V and internal resistance 10 Omega and 5...

    Text Solution

    |

  19. A room AC run for 5 hour at a voltage of 220V The wiring of the room c...

    Text Solution

    |

  20. In an experiment with a potentiometer, VB=10 V. R is adjusted to be 50...

    Text Solution

    |

  21. (a). Consider circuit in figure. How much energy is absorbed by electr...

    Text Solution

    |