1
COMEDK 2024 Morning Shift
+1
-0

The current through a conductor is '$$\mathrm{a}$$' when the temperature is $$0^{\circ} \mathrm{C}$$. It is '$$\mathrm{b}$$' when the temperature is $$100^{\circ} \mathrm{C}$$. The current through the conductor at $$220^{\circ} \mathrm{C}$$ is

A
$$\frac{5 a b}{11 b-6 a}$$
B
$$\frac{5 a b}{6 a-11 b}$$
C
$$\frac{5 a b}{11 a-6 b}$$
D
$$\frac{11 a b}{5 a-6 b}$$
2
COMEDK 2024 Morning Shift
+1
-0

On increasing the temperature of a conductor, its resistance increases because

A
Electron density decreases
B
Relaxation time increases
C
Number of collisions between electrons decreases
D
Relaxation time decreases
3
COMEDK 2023 Morning Shift
+1
-0

A galvanometer having a resistance of $$8 \Omega$$ is shunted by a wire of resistance $$2 \Omega$$. If the total current is $$1 \mathrm{~A}$$, the part of it passing through the shunt will be

A
0.25 A
B
0.8 A
C
0.2 A
D
0.5 A
4
COMEDK 2023 Morning Shift
+1
-0

Two cells with the same emf $$E$$ and different internal resistances $$r_1$$ and $$r_2$$ are connected in series to an external resistance $$R$$. If the potential difference across the first cell is zero then value of $$R$$.

A
$$\sqrt{r_1 r_2}$$
B
$$r_1+r_2$$
C
$$r_1-r_2$$
D
$$\frac{r_1+r_2}{2}$$
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Medical
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