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%
From NCERT
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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 |
From NCERT
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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%
From NCERT
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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 |
From NCERT
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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%
From NCERT
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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%
From NCERT
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In an experiment, a graph was plotted of the potential difference V between the terminals of a cell against the circuit current I by varying load rheostat. Internal conductance of the cell is given by :

(1) xy

(2) yx

(3) xy

(4) (xy)

Subtopic:  Derivation of Ohm's Law |
 71%
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A light bulb, a capacitor and a battery are connected together as shown below with the switch S initially open. When the switch S is closed, which one of the following is true?

      

1. The bulb will light up for an instant when
    the capacitor starts charging.
2. The bulb will light up when
    the capacitor is fully charged.
3. The bulb will not light up at all.
4. The bulb will light up and go off at regular intervals.

Subtopic:  RC Circuit (OLD NCERT) |
 65%
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As in figure shown, if a capacitor C is charged by connecting it with resistance R, then energy  given by the battery will be 

(1) 12CV2

(2) More than 12CV2

(3) Less than 12CV2

(4) Zero

Subtopic:  RC Circuit (OLD NCERT) |
 54%
From NCERT
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