मराठी

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

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प्रश्न

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

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उत्तर

(d) current and potential difference
Ohm's law gives the relationship between current and potential difference.

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पाठ 4: Electricity - Exercise 3

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लखमीर सिंह Physics [English] Class 10
पाठ 4 Electricity
Exercise 3 | Q 25

व्हिडिओ ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्‍न

Find the resistance of a conductor if 0.24 A current is passing through it and a potential difference of 24 V is applied across it.


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


Which of the following is an ohmic resistance?


Show by a diagram how two resistors R1 and R2 are joined in parallel. Obtain an expression for the total resistance of the combination. 


How does an increase in the temperature affect the specific resistance of a : 
(i) Metal and
(ii) Semiconductor ?


A metal sphere is kept on an insulting stands. A negatively charged rod is brought near it, then the sphere is  earthed as shown. On removing the earthing, and taking the negatively charged rod away, what will be the  nature of charge on the sphere? Give reason for your answer. 


Does Ohm's law hold good for semiconductors and electrolytic solutions?

Fig. represents the circuit used for the verification of ohm's law. Label the different parts from A and F. State the function of each.


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 the relation correlating the electric current flowing in a conductor and the voltage applied across it. Also, draw a graph to show this relationship.


What are non-ohmic conductors? Give one exmaple. Draw a current-voltage graph for a non-ohmic conductor.


Draw a neat diagram for the verification of Ohm’s law by voltmeter-ammeter method. By another diagram show the relation between p.d. and current.


A wire connected to a power supply of 230 V has power dissipation P1. Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case, power dissipation is P2. The ratio of `"P"_2/"P"_1` is


State macroscopic form of Ohm’s law.


A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively. Which of the following is true? 


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 ______.


The resistance of a resistor is reduced to half of its initial value. If other parameters of the electrical circuit remain unaltered, the amount of heat produced in the resistor will become ______.


The circuit depicted in the figure is employed for studying Ohm’s Law. Instead of using a standard resistor, a student opts for a glass tube filled with mercury (tube 1), connected to the circuit through two electrodes, E1 and E2. He records the readings of the ammeter and voltmeter, thereby calculating the resistance. The student repeats the experiment by substituting tube 1 with tube 2, where the same amount of mercury fills tube 2.

Neglecting internal resistance of the cell use (> or < or =) to compare:

  1. the resistance in both the cases.
  2. the voltmeter readings in both the cases.
  3. the specific resistance in both the cases.

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