Question:
Ohm's law is valid when:
Ohm's law is valid when:
Show Hint
Ohm's Law is not a universal law; it is a specific property of "Ohmic" materials under stable conditions.
Updated On: May 5, 2026
- Resistance varies with temperature
- Temperature and physical conditions remain constant
- Conductor is non-ohmic
- Frequency of AC is changed
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Concept
Ohm's Law states that the current ($I$) flowing through a conductor is directly proportional to the potential difference ($V$) applied across its ends, provided physical conditions are unchanged.
Step 2: Meaning
The mathematical expression is $V = IR$, where $R$ (resistance) is a constant. For $R$ to remain constant, the properties of the material must not change.
Step 3: Analysis
Resistance is highly dependent on temperature and mechanical strain. If the temperature increases, the internal resistance of most metallic conductors also increases, leading to a non-linear relationship between voltage and current.
Step 4: Conclusion
Therefore, the linear proportionality defined by Ohm's law only holds true when external factors like temperature and pressure are kept constant. Final Answer: (B)
Ohm's Law states that the current ($I$) flowing through a conductor is directly proportional to the potential difference ($V$) applied across its ends, provided physical conditions are unchanged.
Step 2: Meaning
The mathematical expression is $V = IR$, where $R$ (resistance) is a constant. For $R$ to remain constant, the properties of the material must not change.
Step 3: Analysis
Resistance is highly dependent on temperature and mechanical strain. If the temperature increases, the internal resistance of most metallic conductors also increases, leading to a non-linear relationship between voltage and current.
Step 4: Conclusion
Therefore, the linear proportionality defined by Ohm's law only holds true when external factors like temperature and pressure are kept constant. Final Answer: (B)
Was this answer helpful?
0
0
Top TS EAMCET Physics Questions
- A wooden box lying at rest on an inclined surface of a wet wood is held at static equilibrium by a constant force $F$ applied perpendicular to the incline. If the mass of the box is $1\,kg$, the angle of inclination is $30^{\circ}$ and the coefficient of static friction between the box and the inclined plane is $0.2$, the minimum magnitude of $\vec{F}$ is (Use $ g = 10\,m/s^2$)
- A metre scale made of steel reads accurately at $25^{\circ} C$ . Suppose in an experiment an accuracy of $0.06\, mm$ in $1\,m$ is required, the range of temperature in which the experiment can be performed with this metre scale is (coefficient of linear expansion of steel is $ 11 \times 10^{-6} /^{\circ} \, C$ )
- Consider a solenoid carrying current supplied by a DC source with a constant emf containing iron core inside it. When the core is pulled out of the solenoid, the change in current will
- A parallel beam of light of intensity \(I_0\) is incident on a coated glass plate. If \(25\%\) of the incident light is reflected from the upper surface and \(50\%\) of light is reflected from the lower surface of the glass plate, the ratio of maximum to minimum intensity in the interference region of the reflected light is
- A thermocol box has a total wall area (including the lid) of $1.0 m ^{2}$ and wall thickness of $3 cm$. It is filled with ice at $0^{\circ} C$. If the average temperature outside the box is $30^{\circ} C$ throughout the day, the amount of ice that melts in one day is [Use $K_{\text {thermocol }}=0.03 W / mK$ $.L_{\text {fusion (ice) }}=3.00 \times 10^{5} J / kg ]$
View More Questions
Top TS EAMCET Current electricity Questions
The effective capacitance between points A and B shown in the circuit is:
The Wheatstone bridge shown in the diagram is balanced. If P3 is the power dissipated by R3 and P1 is the power dissipated by R1, then the ratio P3/P1 is:
A wire of resistance 2R is stretched such that its length is doubled. Then the increase in its resistance is:
- Two point charges of magnitudes \( -8 \mu C \) and \( +32 \mu C \) are separated by a distance of 15 cm in air. The position of the point from the \( -8 \mu C \) charge at which the resultant electric field becomes zero is:
- The potential difference between the ends of a straight conductor of length 20 cm is 16 V. If the drift speed of the electrons is \( 2.4 \times 10^{-4} \) m/s, the electron mobility in \( m^2 V^{-1} s^{-1} \) is:
View More Questions
Top TS EAMCET Questions
- A bag contains $5$ red balls, $3$ black balls and $4$ white balls are drawn at random. The probability that they are not of same colour is
- If $cosec\, \theta - \cot \theta = 2017$, then quadrant in which $\theta $ lies is
- If $a$ is a unit vector, then $| a \times \hat{ i }|^{2}+| a \times \hat{ j }|^{2}+| a \times \hat{ k }|^{2}=$
- $A$ straight line makes an intercept on the $Y$-axis twice as long as that on $X$-axis and is at a unit distance from the origin. Then the line is represented by the equations
- Let $S$ and $S'$ be the foci of an ellipse and B be one end of its minor axis. If $SBS'$ is an isosceles right angled triangle then the eccentricity of the ellipse is
View More Questions