# Simple Circuit

## Trending Questions

**Q.**Each side of regular polygon of n sides has a resistance R. The equivalent resistance between any two adjacent vertices is

- nR
- Rn
- (n−1)Rn
- nn−1R

**Q.**

A capacitor of capacitance $\mathrm{C}$ is charged to a potential difference $\mathrm{V}$ from a cell and then disconnected from it. A charge $+\mathrm{Q}$ is now given to its positive plate. The potential difference across the capacitor is now _________.

**Q.**

Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of 10 and the second has a voltage gain of 20. If the input signal is 0.01 volt, calculate the output ac signal.

**Q.**

Least count of ammeter and voltmeter are?

**Q.**

Two capacitors of 6 μf and 4 μf are put in series across a 120 V battery. What is the potential difference across the 4 μf capacitor?

60 V

48 V

zero

72 V

**Q.**

In the arrangement of resistances shown below, the effective resistance between points A and B is

$20\Omega $

$30\Omega $

$90\Omega $

$110\Omega $

**Q.**In the circuit shown in the figure, the total charge is 750 μC and the voltage across capacitor C2 is 20 V. Then the charge on capacitor C2 is-

- 450 μC
- 590 μC
- 160 μC
- 650 μC

**Q.**

Four resistances $ 40 \Omega , 60 \Omega , 90 \Omega $ and $ 110 \Omega $ make the arms of a quadrilateral ABCD. Across AC is a battery of EMF $ 40 V$ and internal resistance negligible. The potential difference across BD in $ V$ is _______.

**Q.**The magnitude and direction of the current in the circuit shown will be

- 73 A from a to b through e.
- 73 A from b to a through e.
- 1 A from b to a through e.
- 1 A from a to b through e.

**Q.**In LR circuit, the AC source has voltage 220 V. If the potential difference across the inductor is 176 V, the potential difference across the resistor will be

- 44 V
- 396 V
- 132 V
- 176 V

**Q.**The current in an L−R circuit, in a time t=2LR reduces to

(Take e=2.731)

- 36.5% of maximum
- 13.4% of maximum
- 0.50% of maximum
- 63.2% of maximum

**Q.**

In the figure given, the electric current flowing through the$5k\Omega $ resistor is$xmA.$

The value of $x$ to the nearest integer is ________.

**Q.**In a region of constant potential

- the electric field is zero
- there can be no charge inside the region.
- the electric field is uniform
- the electric field shall necessarily change if a charge is placed outside the region.

**Q.**In the given circuit, the potential of the point E is

- Zero
- -8V
- - 4/3 V
- 4/3 V

**Q.**A cell of emf E and internal resistance r is connected across a variable resistor R. Plot a graph showing variation of terminal voltage V of the cell with the current I. Using the plot, show how the emf of the cell and its internal resistance can be determined.

**Q.**Three light bulbs (60 W, 120 V) are connected across a 120 V power source. If the resistance of each bulb does not change with current, then find out total power delivered to the three bulbs.

- 80 W
- 60 W
- 40 W
- 20 W

**Q.**If in the given figure i = 0.25 amp, then the value R will be

- 48Ω
- 12Ω
- 120Ω
- 42Ω

**Q.**Two identical heater wires are first connected in series and then in parallel with a source of electricity.

The ratio of heat produced in the first case to heat produced in second case is:

- 4:1
- 1:2
- 2:1
- 1:4

**Q.**12 wires each having resistance r are joined to form a cube as shown.find the equivalent resistance between the ends of a face diagonal such as A and C.find the equivalent resistance between ends of an edge such as A and B and also along body diagonal A amd F

**Q.**Consider the circuit shown in the figure. The current i

_{3}is equal to

- 5 amp
- 3 amp
- – 3 amp
- −56 amp

**Q.**Obtain expression for effective emf and internal resistance when two different cell connect parallel

**Q.**

(a)Three resistors 1 Ω, 2 Ω, and 3 Ω are combined in series. What is the total resistance of the combination?

(b) If the combination is connected to a battery of emf 12V and negligible internal resistance, obtain the potential drop across each resistor.

**Q.**First, a set of n equal resistor of 10Ω each are connected in series to a battery of emf 20 V and internal resistance 10Ω. A current I is observed to flow. Then, the n resistors are connected in parallel to the same battery. It is observed that the current is increased 20 times, then the value of n is

**Q.**27. In the given circuit the potential difference across 3uF capacitor will be : (1) 16 V (2) 10 V (3) 6 V (4) 4 V

**Q.**35.In the circuit shown below the cell has emf of 10 V and internal resistance of 1 ohm . The other resistances are shown in figure. Calculate the potential difference V(a)-V(b).

**Q.**

If the cell is short circuited, its terminal potential difference is

zero

unity

infinity

none of these

**Q.**Two coils are at fixed locations. When coil-1 has no current and current in the coil-2 increases at the rate 15.0 As−1. The e.m.f. in the coil-1 is 25.0 mV. When coil-2 has no current and coil-1 has a current of 3.6 A., the flux linkage in coil-2 is-

- 16 mWb
- 10 mWb
- 4 mWb
- 6 mWb

**Q.**The deflection produced in the galvanometer is reduced to 45 divisions from 55 when a shunt of 8 ohm is used. Calculate the resistance of the galvanometer.

**Q.**A uniformly wound long solenoid of self inductance L is cut into two parts having lengths in the ratio 1:2, which are then connected in parallel. The effective inductance of the combination will be -

- 2L9
- L9
- 4L9
- 5L9

**Q.**

The potential difference between the terminals of a battery of emf 6.0 V and internal resistance 1 Ω drops to 5.8 V when connected across an external resistor. Find the resistance of the external resistor.