Advertisements
Advertisements
प्रश्न
A uniform wire of resistance 50 Ω is cut into 5 equal parts. These parts are now connected in parallel. The equivalent resistance of the combination is ______________ .
पर्याय
2 Ω
10 Ω
250 Ω
6250 Ω
उत्तर
2 Ω
Resistance of a wire is directly proportional to its length.
So, when we cut the wire into 5 equal parts, the resistance of each part will be 10 Ω.
On connecting these wires in parallel, the net resistance will be
\[\frac{1}{R} = \frac{1}{10} + \frac{1}{10} + \frac{1}{10} + \frac{1}{10} + \frac{1}{10} \]
\[ \Rightarrow R = 2 \Omega\]
APPEARS IN
संबंधित प्रश्न
Two resistors R1 = 400Ω and R2 = 20 n are connected in parallel to a battery. If heating the power developed in R1 is 25 W. find the heating power developed in R2
Two heating elements of resistances R1 and R2 when operated at a constant supply of voltage, V, consume powers P1 and P2 respectively. Deduce the expressions for the power of their combination whey they are, in turn, connected in (i) series and (ii) parallel across the same voltage supply.
Two resistances R and 2R are connected in parallel in an electric circuit. The thermal energy developed in R and 2R are in the ratio _______________ .
Suppose you have three resistors of 20 Ω, 50 Ω and 100 Ω. What minimum and maximum resistance can you obtain from these resistors?
If the reading of the ammeter, A1 in the following figure is 2.4 A, what will be the readings of ammeters A2 and A3? Neglect the resistances of the ammeters.
A bulb is made using two filaments. A switch selects whether the filaments are used individually or in parallel. When used with a 15 V battery, the bulb can be operated at 5 W, 10 W or 15 W. What should be the resistances of the filaments?
The emf ε and the internal resistance r of the battery, shown in the figure, are 4.3 V and 1.0 Ω respectively. The external resistance R is 50 Ω. The resistances of the ammeter and voltmeter are 2.0 Ω and 200 Ω respectively. (a) Find the readings of the two meters. (b) The switch is thrown to the other side. What will be the readings of the two meters now?
The voltmeter shown in the figure reads 18 V across the 50 Ω resistor. Find the resistance of the voltmeter.
A voltmeter coil has resistance 50.0 Ω and a resistor of 1.15 kΩ is connected in series. It can read potential differences up to 12 volts. If this same coil is used to construct an ammeter that can measure currents up to 2.0 A, what should be the resistance of the shunt used?
Two resistors R1= 60 Ω and R2 = 90Ω are connected in parallel. If electric power consumed by the resistor R1 is15 W, calculate the power consumed by the resistor R2.
A current of 2 A flows in conductors as shown. The potential difference VA- VB will be ________.
If two resistors of resistances R1 = (4 ± 0.5) Ω and R2 = (16 ± 0.5) Ω are connected in series. The eqivalent resistance with the limits of percentage error is ______.
The figure shows three conductors I, II and III of same material, different lengths l, 2l and 3l and of different areas of cross-sections 3A, A and 2A respectively. Arrange them in the increasing order of current drawn from the battery.
A condenses having a capacity 2.0 µF is charged to 200 V and the plates of the capacitor are connected to a resistance wire. The heat produce in it will be:-
The equivalent resistance of resistors connected in series is always ______
The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and the same material is 0.25 Ω. What will be the effective resistance if they are connected in series?
A wire of uniform cross-section and resistance 4 ohms is bent in the shape of square ABCD. Point A is connected to point P on DC by a wire AP of resistance 1 ohm. When a potential difference is applied between A and C, the points B and P are seen to be at the same potential. What is the resistance of the part DP?
Three bulbs B1 (230V, 40W), B2 (230V, 60W) and B3 (230V, 100W) are connected in series to a 230V supply. Which bulb glows the brightest?
