मराठी
महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता ११ वी

Choose the correct alternative. Which of the following is an ohmic conductor? - Physics

Advertisements
Advertisements

प्रश्न

Choose the correct alternative.

Which of the following is an ohmic conductor?

पर्याय

  • transistor

  • vacuum tube

  • electrolyte

  • nichrome wire

MCQ
Advertisements

उत्तर

nichrome wire

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 11: Electric Current Through Conductors - Exercises [पृष्ठ २१९]

APPEARS IN

बालभारती Physics [English] Standard 11 Maharashtra State Board
पाठ 11 Electric Current Through Conductors
Exercises | Q 1. (ii) | पृष्ठ २१९

व्हिडिओ ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्‍न

Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?


When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.


What is an Ohmic resistor?


Write the formula of resistivity


Name the physical quantity whose unit is "ohm".


 Name the law which is illustrated by the above VI graph.


The graph between V and I for a conductor is a straight line passing through the origin. 

 What should remain constant in a statement of this law?


State Ohm’s law and draw a neat labelled circuit diagram containing a battery, a key, a voltmeter, an ammeter, a rheostat and an unknown resistance to verify it. 


In an experiment of verification of Ohm’s law following observations are obtained.

Potential difference V (in volt)

0.5 1.0 1.5 2.0 2.5
current I (in ampere) 0.2 0.4 0.6 0.8 1.0

Draw a V-I graph and use this graph to find:

  1. the potential difference V when the current I is 0.5 A,
  2. the current I when the potential difference V is 0.75 V,
  3. the resistance in a circuit.

How would you connect two resistors in series? Draw a diagram. Calculate the total equivalent resistance.  


A wire has a length of 2.0 m and a resistance of 5.0 Ω. Find the electric field existing inside the wire if it carries a current of 10 A.


Calculate the effective resistance across AB?


Two metallic spheres A and B kept on insulating stands are in contact with each other. A positively charged  rod P is brought near the sphere A as shown in the figure. The two spheres are separated from each other,  and the rod P is removed. What will be the nature of charges on spheres A and B?


Define one 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.


What is meant by the drift speed of free electrons?


Answer the following question.

Distinguish between Ohmic and non-ohmic substances; explain with the help of example.


Ohm’s law states the relationship between power and voltage.


State macroscopic form of Ohm’s law.


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


An electronics hobbyist is building a radio which requires 150 Ω in her circuit, but she has only 220 Ω, 79 Ω, and 92 Ω resistors available. How can she connect the available resistors to get the desired value of resistance?


Two cells each of 5V are connected in series across an 8Ω resistor and three parallel resistors of 4Ω, 6Ω, and 12Ω. Draw a circuit diagram for the above arrangement. Calculate

  1. the current drawn from the cell
  2. current through each resistor

Assertion: The statement of Ohm’s law is K = IR.

Reason: V = IR is the equation which defines resistance.


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 j (current density) changes in an exact manner, while the current I remain unaffected. The agent that is essentially responsible for is ______.


A metal rod of length 10 cm and a rectangular cross-section of 1 cm × `1/2` cm is connected to a battery across opposite faces. The resistance will be ______.


Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1 mm. Conductor B is a hollow tube of outer diameter 2 mm and inner diameter 1 mm. Find the ratio of resistance RA to RB.


Why should an ammeter have low resistance?


A current of 0.8 A flows in a conductor of 40 Ω for 1 minute. The heat produced in the conductor will be ______.


A current of 3.2 mA flows through a conductor. If charge on an electron is −1.6 × 10-19 coulomb, find the number of electrons that will pass each second through the cross section of that conductor.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×