Which of the following quantities does not ch | vedclass

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(D) When a resistor is heated due to the flow of current, its temperature increases.$1$. Resistance $(R)$ and resistivity $(\rho)$ are temperature-dep

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number of free electrons

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(D) When a resistor is heated due to the flow of current, its temperature increases.$1$. Resistance $(R)$ and resistivity $(ho)$ are temperature-dependent properties of a conductor. As temperature increases, the relaxation time of electrons decreases, causing both $R$ and $ho$ to change.$2$. Drift speed $(v_d)$ is given by $v_d = \frac{eE	au}{m}$, where $	au$ is the relaxation time. Since $	au$ changes with temperature, the drift speed also changes.$3$. The number of free electrons $(n)$ is a property of the material itself (the number of valence electrons per unit volume). This value remains constant regardless of the temperature changes within the operating range of the resistor.Therefore, the number of free electrons does not change. The correct option is $D$.

Which of the following quantities does not change when a resistor connected to a battery is heated due to the current?

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The quantities that do not change when a resistor connected to a battery is heated due to the current are:
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