The two ends of a uniform conductor are joined to a cell of e.m.f. E and some internal resistance. Starting from the midpoint P of the conductor, we move in the direction of current and return to P. The potential V at every point on the path is plotted against the distance covered (x). Which of the following graphs best represents the resulting curve

(1)

(2)

(3)

(4)

Subtopic:  EMF & Terminal Voltage |
 50%
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The resistance Rt of a conductor varies with temperature t as shown in the figure. If the variation is represented by Rt=R01+αt+βt2, then 

(1) α and β are both negative

(2) α and β are both positive

(3) α is positive and β is negative

(4) α is negative and β are positive

Subtopic:  Derivation of Ohm's Law |
 74%
PMT - 1988
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Variation of current and voltage in a conductor has been shown in the diagram below. The resistance of the conductor is :

(1) 4 ohm

(2) 2 ohm

(3) 3 ohm

(4) 1 ohm

Subtopic:  Derivation of Ohm's Law |
 89%
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Resistance as shown in figure is negative at

(1) A

(2) B

(3) C

(4) None of these

Subtopic:  Derivation of Ohm's Law |
 58%
From NCERT
PMT - 1997
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For a cell, the graph between the potential difference \((V)\) across the terminals of the cell and the current \((I)\) drawn from the cell is shown in the figure below. The emf and the internal resistance of the cell are, respectively:

             
1. \(2~\text{V}, 0.5 ~\Omega\) 2. \(2~\text{V}, 0.4 ~\Omega\)
3. \(>2~\text{V}, 0.5 ~\Omega\) 4. \(>2~\text{V}, 0.4 ~\Omega\)
Subtopic:  EMF & Terminal Voltage |
 65%
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When a current I is passed through a wire of constant resistance, it produces a potential difference V across its ends. The graph drawn between log I and log V will be

(1)

(2)

(3)

(4)

Subtopic:  Derivation of Ohm's Law |
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The V-I graph for a conductor at temperature T1 and T2 are as shown in the figure. (T2T1) is proportional to :

(1) cos2θ

(2) sinθ

(3) cot2θ

(4) tanθ

Subtopic:  Derivation of Ohm's Law |
 60%
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A cylindrical conductor has a uniform cross-section. The resistivity of its material increases linearly from the left end to the right end. If a constant current is flowing through it and at a section distance x from the left end, the magnitude of electric field intensity is E, which of the following graphs is correct :

(1)

(2)

(3)

(4)

Subtopic:  Derivation of Ohm's Law |
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The V-I graph for a conductor makes an angle θ with V-axis. Here V denotes the voltage and I denotes current. The resistance of the conductor is given by :

(1) sinθ

(2) cosθ

(3) tanθ

(4) cotθ

Subtopic:  Derivation of Ohm's Law |
 58%
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A battery consists of a variable number \('n'\) of identical cells having internal resistances connected in series. The terminals of battery are short circuited and the current \(i\) is measured. The graph below that shows the relationship between \(i\) and \(n\) is:

1.   2.
3. 4.
Subtopic:  Grouping of Cells |
 72%
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