COMEDK 2025 Afternoon Shift | Current Electricity Question 6 | Physics

Two wires A and B made of same material having length 10 cm and 40 cm respectively are connected in parallel to the same source of emf 10 V . What will be the ratio of the drift velocity of the electrons in the wire $A$ to the drift velocity in the wire $B$ ?

$\frac{V_{d A}}{V_{d B}}=1: 4$

$\frac{V_{d A}}{V_{d B}}=1: 2$

$\frac{V_{d A}}{V_{d B}}=4: 1$

$\frac{V_{d A}}{V_{d B}}=2: 1$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

A student measures the terminal potential difference $V$ of a cell (emf $\varepsilon$ and internal resistance $r$ ) as a function of current I flowing through it, and draws V versus I graph. The slope and intercept of the graph respectively are

$-r,-\varepsilon$

$-r, \varepsilon$

$r,-\varepsilon$

$r, \varepsilon$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

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A galvanometer of resistance $50 \Omega$ is connected to a battery of 4 V along with a resistance of $3950 \Omega$ in series. A full-scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 10 divisions, the resistance in series should be equal to:

8950 ohm

11950 ohm

7000 ohm

6000 ohm

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

Two identical conductors of lengths 1 and 31 respectively are maintained at the same temperature. They are given potential differences in the ratio $1: 3$. The ratio of their drift velocities is

$1: 9$

$9: 1$

$1: 1$

$1: 3$

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