Home
Class 12
PHYSICS
For a metallic wire, the ratio V/i ( V= ...

For a metallic wire, the ratio `V/i` ( `V=` applied potential difference and `i=` current flowing ) is

A

independent of temperature.

B

increases with rise in temperature.

C

increases or decreases with rise in temperature depending upon the metal.

D

decreases with rise in temperature.

Text Solution

Verified by Experts

The correct Answer is:
B
According to Ohm's law, the ratio of the voltage to the corresponding current is represented as resistance i.e.,
`V/l=R` (resistance)
For a metallic wire, with the increase in temperature the resistance also increase due to increased motion of the thermal electrons inside it.
Promotional Banner

Topper's Solved these Questions

  • MHTCET 2018

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise Physics|50 Videos

  • MHTCET 2019 PAPER 2

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise PHYSICS|50 Videos

Similar Questions

Explore conceptually related problems

In an AC circuit, the applied potential difference and the current flowing are given by V=20sin100tvolt,I=5sin(100t-pi/2) amp The power consumption is equal to

The resistance R of a conductor is defind as the ratio of the potential difference applied across it to the current flowing through ti . If V = (100 pm 5) V and I = (5 + 0.1) A , what is the percentage error in R ?

The resistance of a metal is given by R = V//I , where V is potential difference and I is current . In a circuit , the potential difference across resistance is V = ( 8 +- 0.5) V and current in resistance , I = ( 4 +- 0.2)A . What is the value of resistance with its percentage error?

If a power of 100 W is being supplied across a potential difference of 200 V , current flowing is

The curves (a) , (b) , ( c ) and (d) show the variation between the applied potential difference (V) and the photoelectric current (i) , at two different intensities of light (I_(1) gt I_(2)) . In which figure is the correct variation shown ?

The direction of conventional current flowing through a metal due to applied potential difference or electric field is

When a current of 2 A flows in a battery from negative to positive terminal, the potential difference across it is 12 V. If a current of 3 A flowing in the opposite direction produces a potential difference of 15 V, the emf of the battery is

When a current of 2 A flows in a battery from negative to positive terminal, the potential difference across it is 20 V. If a current of 3 A flowing in the opposite direction produces a potential difference of 25 V, the emf of the battery is

(a) What is the ratio of potential difference and current known as? (b) The values of potential difference V applied across a resistor and the corresponding values of current I flowing in the resistor are given below: {:("Potential difference"V("in volts"),:,2.5,5.0,10.0,15.0,20.0,25.0),("Current,I"("in amperes"),:,0.1,0.2,0.4,0.6,0.8,1.0):} Plot a graph between V and I, and calculate the resistance of the resistor. (c) Name the law which is illustrated by the above V-I graph. (d) Write down the formula which states the relations between potential difference, current and resistance. (d) The potential difference between the terminals of an electric iron is 240V and the current is 5.0A. What is the resistance of the electric iron?

Calculate the drift speed developed in a metal wire when V potential difference is applied across length l of the wire. The number of free electrons per unit volume is n and conductivity of the material is sigma .

MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-MHTCET 2019 PAPER 1-PHYSICS
  1. Two small drops of mercury, each of radius R, coalesce to form a singl...

    Text Solution

    |

  2. A solid aluminimum sphere of radius R has moment of inertia I about an...

    Text Solution

    |

  3. For a metallic wire, the ratio V/i ( V= applied potential difference a...

    Text Solution

    |

  4. In air, a charged soap bubble of radius 'R' breaks into 27 small soap ...

    Text Solution

    |

  5. The two linear parallel conductors carrying currents in the opposite d...

    Text Solution

    |

  6. A layer of atmosphere that reflects medium frequency radio waves which...

    Text Solution

    |

  7. The linear density of a vibrating string is 1.3 xx 10^(-4) kg//m A tra...

    Text Solution

    |

  8. A satellite of mass , os revolving round the eartj at height of 10R, w...

    Text Solution

    |

  9. The distance moved by a particle in simple harmonic motion in one time...

    Text Solution

    |

  10. In full scale deflection current in galvanometer of 100 ohm resistance...

    Text Solution

    |

  11. The angle made by orbital angular momentum of electron with the direct...

    Text Solution

    |

  12. The current in 1 Omega resistor in the following circuit is

    Text Solution

    |

  13. The wavelength of the first line in blamer series in the hydrogen spec...

    Text Solution

    |

  14. If the work done in stretching a wire by 1 mm is 2J, then work necessa...

    Text Solution

    |

  15. The resultant R of vector P andQ is perpendicular to P and R=P both ,...

    Text Solution

    |

  16. Resolving power of a telescope will be more, fi the diameter (a) of th...

    Text Solution

    |

  17. A uniform rod of length '6L' and mass '8 m' is pivoted at its centre '...

    Text Solution

    |

  18. If sqrt(A^(2)+B^(2)) represents the magnitude of resultant of two vect...

    Text Solution

    |

  19. A thin metal wire of length 'L' and uniform linear mass density 'p' is...

    Text Solution

    |

  20. The dimensions of torque are same as that of

    Text Solution

    |