AP EAPCET 2022 - 5th July Morning Shift | Current Electricity Question 25 | Physics

The resistance of wire at $$0^{\circ} \mathrm{C}$$ is $$20 \Omega$$. If the temperature coefficient of the resistance is $$5 \times 10^{-3}{ }^{\circ} \mathrm{C}^{-1}$$. The temperature at which the resistance will be double of that at $$0^{\circ} \mathrm{C}$$ is

$$10^{\circ} \mathrm{C}$$

$$200^{\circ} \mathrm{C}$$

$$250^{\circ} \mathrm{C}$$

$$300^{\circ} \mathrm{C}$$

AP EAPCET 2022 - 4th July Evening Shift

MCQ (Single Correct Answer)

-0

The electrons take $$40 \times 10^3$$ s to dirift from one end of a metal wire of length 2 m to its other end. The area of cross-section of the wire is $$4 \mathrm{~mm}^2$$ and it is carrying a current of 1.6 A. The number density of free electrons in the metal wire is

$$8 \times 10^{28} \mathrm{~m}^{-3}$$

$$6 \times 10^{28} \mathrm{~m}^{-3}$$

$$4 \times 10^{28} \mathrm{~m}^{-3}$$

$$5 \times 10^{28} \mathrm{~m}^{-3}$$

AP EAPCET 2022 - 4th July Evening Shift

MCQ (Single Correct Answer)

-0

The current 'I' in the circuit shown in the figure is

AP EAPCET 2022 - 4th July Evening Shift Physics - Current Electricity Question 26 English

$$\varepsilon/R$$

$$-\varepsilon/R$$

$$2\varepsilon/R$$

$$-2\varepsilon/R$$

AP EAPCET 2022 - 4th July Morning Shift

MCQ (Single Correct Answer)

-0

Current density in a cylindrical wire of radius $$R$$ varies with radial distance as $$\beta\left(r+r_0\right)^2$$. The current through the section of the wire shown in the figure is

AP EAPCET 2022 - 4th July Morning Shift Physics - Current Electricity Question 28 English

$$\pi \beta\left[\frac{R^4}{12}+\frac{r_0^2 R^2}{6}+\frac{2 r_0 R^3}{9}\right]$$

$$\pi \beta\left[\frac{R^4}{6}+\frac{r_0^2 R^2}{12}+\frac{r_0 R^3}{9}\right]$$

$$\pi \beta\left[\frac{R^4}{12}+\frac{r_0^2 R^2}{12}+\frac{r_0 R^3}{9}\right]$$

$$\pi \beta\left[\frac{R^4}{8}+\frac{r_0^2 R^2}{6}+\frac{r_0 R^3}{12}\right]$$

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