If the wire has a uniform cross-section, the potential gradient remains uniform along its length.

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

The jockey is used to find the balance point where the potential difference is equal to the reference voltage.

Increasing the emf of the cell increases the balancing length, as it requires a longer length to balance the higher voltage.

Increasing the resistance of the wire decreases the current, which causes the null point to move away from the battery.

Increasing the resistance of the wire decreases the current, which in turn decreases the potential difference across any segment of the wire.

If the length of the segment is halved, the potential difference across that segment also halves, assuming the potential gradient remains constant.

The reading of a potentiometer is independent of the resistance of the wire as long as the potential difference remains constant.

As temperature increases, the resistance of the wire typically increases, which can affect the potential gradient and thus the reading.

If the wire is heated and its resistance increases, the reading of the potentiometer decreases because the potential gradient will be affected.

Increasing the resistance of the galvanometer reduces the current through it, which can lead to a decrease in the reading on the potentiometer.

Increasing the diameter of the potentiometer wire decreases its resistance, as resistance is inversely proportional to the cross-sectional area of the wire.

Increasing the resistance in the circuit decreases the current according to Ohm's law.

Increasing the resistance of the potentiometer wire while keeping the voltage constant decreases the current, which in turn decreases the potential gradient.

Increasing the temperature generally increases the resistance of the potentiometer wire due to the increased vibrations of the atoms in the conductor.

The resistance of most conductive materials increases with temperature due to increased atomic vibrations that impede electron flow.

A potentiometer provides more accurate measurements because it measures voltage by balancing rather than drawing current from the circuit.

Maximum voltage = Potential gradient × Length = 0.1 V/m × 20 m = 2 V.

A potentiometer measures voltage by balancing it against a known voltage, allowing for accurate voltage measurements without drawing current from the circuit.

A potentiometer measures voltage by balancing it against a known voltage, allowing for accurate voltage measurements.

The galvanometer indicates the balance point in a potentiometer circuit, showing when the potential difference across the wire equals the unknown voltage.

The jockey is used to find the balance point in the potentiometer setup by sliding along the wire.

The jockey is used to find the null point where the potential difference is balanced, indicating the measurement of the unknown voltage.

A potentiometer is typically used in a closed circuit to measure voltage without drawing current.

A potentiometer setup typically uses a series circuit to ensure a constant current flows through the wire.

Using the formula Vx/Vk = Lx/Lk, we have Vx = Vk * (Lx/Lk). Here, Lx = 4 m, Lk = 10 m, Vk = 12 V, thus Vx = 12 V * (4/10) = 4.8 V.

The condition for balance in a potentiometer is that the potential difference across the galvanometer must be zero, indicating that the unknown voltage is equal to the voltage across the potentiometer wire.

The circuit must be open when measuring the emf of a cell with a potentiometer to ensure that no current flows through the cell, allowing for an accurate measurement.

At balance, the potential difference across the cell equals the potential drop across the potentiometer wire.

Keeping the circuit closed ensures that the current flows properly, allowing for accurate voltage measurements.