COMEDK 2026 Afternoon Shift | Current Electricity Question 2 | Physics

A parallel combination of ' $n$ ' cells of emf ' $E$ ' and internal resistance ' $r$ ' each, are connected across the external resistance ' $R$ '. If the external resistance ' $R$ ' is negligibly small, then the current ' $I$ ' through the external resistance is:

$I=\frac{E}{n R}$

$I=\frac{E}{R}$

$I=\frac{n E}{R}$

$I=\frac{r E}{n}$

COMEDK 2026 Afternoon Shift

MCQ (Single Correct Answer)

-0

The dimensional formula for specific resistance is:

$\left[M L^3 T^3 A^2\right]$

$\left[M L^3 T^{-3} A^{-2}\right]$

$\left[M L^{-3} T^{-2} A^{-2}\right]$

$\left[M L^3 T^{-3} A^2\right]$

COMEDK 2026 Afternoon Shift

MCQ (Single Correct Answer)

-0

The voltage - current graph for a metal wire of uniform area of cross section at two different temp $T$ and $T^{\prime}$ is shown.

Then choose the correct statement:

COMEDK 2026 Afternoon Shift Physics - Current Electricity Question 1 English

Resistivity is independent of temperature

Resistance of the conductor at temperature T is greater than resistance of the conductor at temperature $\mathrm{T}^{\prime}$

Temperature $\mathrm{T}^{\prime}$ is greater than temperature T

Temperature T is greater than temperature $\mathrm{T}^{\prime}$

COMEDK 2026 Morning Shift

MCQ (Single Correct Answer)

-0

A wire of length 1 m has a resistance of $20 \Omega$ at $0^{\circ} \mathrm{C}$. It is uniformly stretched so that its length increases by $21 \%$. Assuming the volume of the wire remains constant, the percentage change in resistance is $n \%$. Alternatively, if the wire is heated [without stretching] through a temperature of $27^{\circ} \mathrm{C}$ and if the temperature coefficient of resistance of the material of wire is $0.004 K^{-1}$, the percentage change in resistance is $m \%$. The values of $m$ and $n$ are:

2.08 and 1.64

10.8 and 46.4

20.8 and 16.4

1.08 and 4.64

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