What is a null point in a potentiometer?

A null point in a potentiometer is known as a balancing point.

It is the point on the slide wire on which the deflection in the galvanometer is zero.
When the galvanometer detects a current where the deflection is zero, no current flows through the cell.
Therefore, zero deflection means no current is flowing through the galvanometer.

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1.
Two parallel plate capacitors X and Y are connected in series to a 6 V battery. They have the same plate area and same plate separation but capacitor X has air between its plates, whereas capacitor Y contains a material of dielectric constant 4. Calculate the capacitances of X and Y, if the equivalent capacitance of the combination of X and Y is \( 4 \, \mu\text{F} \). Calculate the potential difference across the plates of X and Y.
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2.
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Write the expression for the magnetic field due to a current element in vector form. Consider a 1 cm segment of a wire, centered at the origin, carrying a current of 10 A in positive x-direction. Calculate the magnetic field \( \mathbf{B} \) at a point \( (1 \, \text{m}, 1 \, \text{m}, 0) \).
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