Questions in Current Electricity

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The current in a simple series circuit is 5.0 amp. When an additional resistance of 2.0 ohms is inserted, the current drops to 4.0 amp. The original resistance of the circuit in ohms was
In the circuit given $E = 6.0 V$, $R_1 = 100$ ohms, $R_2 = R_3 = 50$ ohms, $R_4 = 75$ ohms. The equivalent resistance of the circuit, in ohms, is Question Image
By using only two resistance coils-singly, in series, or in parallel one should be able to obtain resistances of 3, 4, 12 and 16 ohms. The separate resistances of the coil are
In the given circuit, the voltmeter records 5 volts. The resistance of the voltmeter in ohms is Question Image
In the adjoining circuit, the battery ${E_1}$ has an $e.m.f.$ of $12\,volt$ and zero internal resistance while the battery $E$ has an $e.m.f.$of$2\,volt$. If the galvanometer $G$ reads zero, then the value of the resistance $X$ in ohm is Question Image
The magnitude and direction of the current in the circuit shown will be Question Image
A cell of $e.m.f.$$1.5\,V$ having a finite internal resistance is connected to a load resistance of $2\,\Omega $. For maximum power transfer the internal resistance of the cell should be
By a cell a current of 0.9 A flows through 2 ohm resistor and 0.3 A through 7 ohm resistor. The internal resistance of the cell is
The e.m.f. of a cell is E volts and internal resistance is $r$ohm. The resistance in external circuit is also$r$ohm. The p.d. across the cell will be
A cell of e.m.f.$E$ is connected with an external resistance $R$, then p.d. across cell is $V$ The internal resistance of cell will be

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