NEET Physics Current Electricity Kirchhoff'S Law And Wheatstone Bridge MCQs

A Wheatstone bridge is balanced when the galvanometer shows zero deflection. If a known resistance $R_1$ is doubled and the unknown resistance $R_x$ is halved, while keeping $R_2$ and $R_3$ constant, which of the following operations will rebalance the bridge?

Two batteries with EMFs $E_1$ and $E_2$ and internal resistances $r_1$ and $r_2$ respectively are connected in parallel across a resistor R. The current through R is zero. Which of the following relations must hold true?

In a Wheatstone bridge with resistances $R_1$, $R_2$, $R_3$, and $R_x$, the galvanometer shows null deflection. If a shunt resistance $S$ is connected parallel to $R_3$, what is the equivalent resistance that replaces $R_3$ in the balanced condition?

A potentiometer wire of length $L$ and resistance $R$ is connected to a battery of EMF $E$ and internal resistance $r$. A cell of EMF $E/2$ is balanced at a length $L/3$. What is the internal resistance of the cell?

A complex network has n junctions and b branches. Applying Kirchhoff's laws, what is the minimum number of independent loop equations required to solve the network?

In a meter bridge experiment, null point is obtained at $l$ cm from the left end. If a resistance $X$ is connected in series with the unknown resistance $R$, the null point shifts to $l'$ cm. What is the value of $R$?

In a Wheatstone bridge, the galvanometer shows zero deflection. What is the relationship between the resistances?

Kirchhoff's Junction Rule is a consequence of which conservation law?

In a Wheatstone bridge, if the resistances are P = 10 Ω, Q = 20 Ω, R = 30 Ω, and the bridge is balanced, what is the value of S?

Which instrument is used to detect the null point in a Wheatstone bridge?