Question 576: Current Electricity

Question

In the network shown cell E has internal resistance $r$ and the galvanometer shows zero deflection. If the cell is replaced by a new cell of emf $2 E$ and internal resistance $3 r$ keeping everything else identical, then

Accepted Answer

In given circuit diagram, galvanometer shows
zero deflection, hence it is a Wheatstone balanced circuit.
Hence, $\quad V_A=V_B$
On replacing a new cell of emf $2 E$ and internal resistance $3 r$, no effect occurs on balanced condition of bridge, i.e., $V_A=V_B$.
Hence, the galvanometer will shows zero deflection.

Answer

The galvanometer will show deflection of 10 divisions.

Answer

The galvanometer show zero deflection,

Answer

Current will flow from $B$ to $A$.

Answer

Current will flow from $A$ to $B$.

Current Electricity

In the network shown cell E has internal resistance r and the galvanometer shows zero deflection. If the cell is replaced by a new cell of emf 2 E and internal resistance 3 r keeping everything else identical, then

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