हिंदी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Is Ohm’s law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm’s law. - Physics

Advertisements
Advertisements

प्रश्न

Is Ohm’s law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm’s law.

टिप्पणी लिखिए

उत्तर

No, Ohm’s law is not universally applicable for all conducting elements. Vacuum diode semi-conductor is a non-ohmic conductor. Ohm’s law is not valid for it.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 3: Current Electricity - Exercise [पृष्ठ १२९]

APPEARS IN

एनसीईआरटी Physics [English] Class 12
अध्याय 3 Current Electricity
Exercise | Q 3.18 (b) | पृष्ठ १२९
एनसीईआरटी Physics [English] Class 12
अध्याय 3 Current Electricity
Exercise | Q 18.2 | पृष्ठ १२९

वीडियो ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्न

What will be the change in the current if the potential difference is kept constant and the resistance of the circuit is made four times?

  1. It will remain unchanged.
  2. It will become four times.
  3. It will become one-fourth.
  4. It will become half.

Ohm's law gives a relationship between:

(a) current and resistance
(b) resistance and potential difference
(c) potential difference and electric charge
(d) current and potential difference


What is the necessary condition for a conductor to obey Ohm’s law? 


An electric bulb draws 1.2 A current at 6.0 V. Find the resistance of filament of bulb while glowing.


A car bulb connected to a 12 volt battery draws 2 A current when glowing. What is the resistance of the filament of the bulb? Will the resistance be more same or less when the bulb is not glowing?


In the circuit shown below in Fig, calculate the value of x if the equivalent resistance between A and B is 4 Ω.


Calculate the electric field in a copper wire of cross-sectional area 2.0 mm2 carrying a current of 1 A.
The resistivity of copper = 1.7 × 10–8 Ω m


Calculate the effective resistance across AB?


State Ohm's law. Is it always true?

Define the following:
 (i) Coulomb
(ii) Ohm


  1. Name and state the law which relates the potential difference and current in a conductor.
  2. What is the necessary condition for a conductor to obey the law named above in part (a) ?

The filament of a bulb takes a current 100 mA when potential difference across it is 0.2 V. When the potential difference across it becomes 1.0 V, the current becomes 400 mA. Calculate the resistance of filament in each case and account for the difference.


State Ohm’s law.


Define Current density.


Define temperature coefficient of resistance.


Write a short note on superconductors?


Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.


A heater of 220 V heats a volume of water m 5 mint time. A heater of 110 V heat in ten second. The resistance of the conductor is


State Ohm's Law. Represent it mathematically.


Why should an ammeter have low resistance?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×