HARD
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The figure shows a circuit having eight resistances of 1 Ω each, labelled R1 to R8, and two ideal batteries with voltages ε1=12 V and ε2=6 V.

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Which of the following statement(s) is(are) correct?

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Important Questions on Current Electricity

HARD
A letter 'A' is constructed of a uniform wire with resistance 1.0 Ω cm-1. The sides of the letter are 20 cm and the cross-piece in the middle is 10 cm long. The apex angle is 60o. The resistance between the ends of the legs is
MEDIUM
Two ideal batteries of emf V1 and V2 and three resistances R1, R2 and R3 are connected as shown in the figure. The current in resistance R2 would be zero if

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EASY
Two resistors 400 Ω  and  800 Ω are connected in series across a 6 battery. The potential difference measured by a voltmeter of 10  across 400 Ω resistor is close to:
MEDIUM

In the circuit, given in the figure currents in different branches and value of one resistor are shown. Then potential at point B with respect to the point A is:

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MEDIUM
Consider the circuit shown below where all resistors are of 1 .
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If a current of magnitude, 1 mA flows through the resistor marked X, what is the potential difference measured between points A and L?
MEDIUM

An ideal cell of emf 10 V is connected in circuit shown in figure. Each resistance is 2 Ω. The potential difference (in V) across the capacitor when it is fully charged is _____________

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MEDIUM
For the circuit shown, with R1=1.0 Ω , R2=2.0 Ω , E1=2 V and E2=E3=4 V, the potential difference between the points a and b is approximately ( in V ):
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MEDIUM

What will be current through the 200 Ω resistor in the given circuit, a long time after the switch K is switched on?

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EASY

In the circuit, wire 1 is of negligible resistance. Then

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HARD

The figure below shows a circuit and its input voltage Vi as a function of time t.

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Assuming the diodes to be ideal, which of the following graphs depicts the output voltage Vo as function of time t ?

EASY

The resistance in following circuit are R1=R2=R3=6.0 Ω. The emf of the battery is 12 volts. When switch S is closed, the potential across resistance R1 is changed by an amount.

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EASY

The potential difference VA-VB between the points A and B in the given figure is
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HARD

The current passing through the AB branch of the circuit shown in the figure is:

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HARD
The actual value of resistance R , shown in the figure is 30Ω. This is measured in an experiment as shown using the standard formula R=VI , where V and I are the readings of the voltmeter and ammeter, respectively. If the measured value of R is 5% less, then the internal resistance of the voltmeter is:

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MEDIUM

What is the current I shown in the given circuit?

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EASY

In the circuit, the galvanometer G shows zero deflection. If the batteries A and B have negligible internal resistance, then the value of R is

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MEDIUM

Consider the circuit shown. 

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If all the cells have negligible internal resistance, what will be the current through the 2 Ω resistor when steady state is reached?

EASY

For a diode connected in parallel with a resistor, which is the most likely current (I)-voltage (V) characteristic graph?

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MEDIUM
Consider the circuit shown in the figure below:
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All the resistors are identical. The ratio II' is
MEDIUM
In the given circuit the internal resistance of the 18V cell is negligible. If R1=400 Ω, R3=100 Ω and R4=500 Ω and the reading of an ideal voltmeter across R4 is 5 V, then the value of R2 will be:

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