MEDIUM
JEE Advanced
IMPORTANT
Earn 100

In the given circuit, each resistance is r=18.75 Ω. The current (in A) in the resistance connected across A and B is,
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Important Questions on Electric Current and Circuits

MEDIUM
JEE Advanced
IMPORTANT
In the circuit shown in the figure, find the steady-state charge in 6 μF capacitor (in μC).
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MEDIUM
JEE Advanced
IMPORTANT
In an infinite network of resistance, each resistance of value R=2 Ω, is arranged as shown in the figure. Find the equivalent resistance between A and B (in Ω).
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HARD
JEE Advanced
IMPORTANT
Let C be the capacitance of a capacitor discharging through a resistor R. Suppose t1 be the time taken for the energy stored in the capacitor to reduce to half its initial value and t2 be the time taken for the charge to reduce to one-fourth of its initial value. Then the ratio t1t2 will be,
HARD
JEE Advanced
IMPORTANT
Two conductors have the same resistance at 0°C but their temperature coefficients of resistance are α1 and α2. The respective temperature coefficients of their series and parallel combinations are nearly
HARD
JEE Advanced
IMPORTANT
A resistor R and 2 μF capacitor in series are connected through a switch to 200 V direct supply. Across the capacitor is a neon bulb that lights up at 120 V. Calculate the value of R to make the bulb light up 5 s after the switch has been closed. log102.5=0.4
MEDIUM
JEE Advanced
IMPORTANT
If a wire is stretched to make it 0.1% longer, its resistance will
MEDIUM
JEE Advanced
IMPORTANT

The figure shows an experimental plot discharging of a capacitor in an RC circuit. The time constant τ of this circuit lies between:

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MEDIUM
JEE Advanced
IMPORTANT

In an LCR circuit, as shown below, both switches are open initially. Now the switch S1 is closed and S2 kept open. (q is the charge on the capacitor and τ=RC is the capacitive time constant). Which of the following statement is correct?

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