In a potentiometer, if the wire is made of a material with higher resistivity, w

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Question: In a potentiometer, if the wire is made of a material with higher resistivity, what effect does it have on the potential gradient?

Options:

Correct Answer: It decreases the potential gradient.

Solution:

Higher resistivity increases the resistance of the wire, which decreases the current for a given voltage, thus increasing the potential gradient.

In a potentiometer, if the wire is made of a material with higher resistivity, what effect does it have on the potential gradient?

In a potentiometer, if the wire is made of a material with higher resistivity, what effect does it have on the potential gradient?

Correct Answer: Potential gradient increases.

Step 1: Understand that a potentiometer is a device used to measure voltage by comparing it to a known voltage.
Step 2: Know that the wire in the potentiometer has a certain resistivity, which affects its resistance.
Step 3: Recognize that higher resistivity means the wire has more resistance.
Step 4: Remember that for a given voltage, higher resistance leads to lower current (Ohm's Law: V = IR).
Step 5: Realize that the potential gradient is the change in voltage per unit length of the wire.
Step 6: Since lower current means that the voltage drop across the wire is spread out over the same length, the potential gradient increases.

Potential Gradient – The potential gradient in a potentiometer is defined as the change in potential per unit length of the wire.
Resistivity and Resistance – Resistivity is a material property that affects the resistance of a wire; higher resistivity leads to higher resistance.
Current and Voltage Relationship – According to Ohm's law, for a given voltage, an increase in resistance results in a decrease in current.