Advertisements
Advertisements
प्रश्न
Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?
Will current flow more easily through a thick wire or a thin wire of the same material when connected to the same source? Give reason for your answer.
Advertisements
उत्तर १
The current will flow more easily through thick wire. It is because the resistance of a
conductor is inversely proportional to its area of cross-section. If thicker the wire, less is resistance and hence more easily the current flows.
उत्तर २
Resistance (R) is inversely proportional to the area of the cross-section (A) of the
wire. So, thicker the wire, lower is the resistance of the wire and vice-versa.
Therefore, current can flow more easily through a thick wire than a thin wire.
`R = rho xx l/A`
`R ∝ 1/A`
उत्तर ३
The resistance of a conductor is inversely proportional to its area of cross-section, i.e. `R ∝ 1/A`. So as the conductor is a thick wire, its resistance decreases and current will flow easily through it, in comparison with a thin wire.
APPEARS IN
संबंधित प्रश्न
If the potential difference across the ends of a conductor is 220 V and the resistance of the conductor is 44 Ω (ohm), then the current flowing through is _________.
- 0.2 A
- 0.5 A
- 2 A
- 5 A
Is Ohm’s law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm’s law.
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Calculate the value of the resistance of the resistor.
Name the law which is illustrated by the above V−I graph.
The unit of electrical resistance is:
(a) ampere
(b) volt
(c) coulomb
(d) ohm
The graph between V and I for a conductor is a straight line passing through the origin.
What should remain constant in a statement of this law?
A car bulb connected to a 12 volt battery draws 2 A current when glowing. What is the resistance of the filament of the bulb? Will the resistance be more same or less when the bulb is not glowing?
Calculate the current flowing through a wire of resistance 5 Ω connected to a battery of potential difference 3 V.
Calculate the electric field in a copper wire of cross-sectional area 2.0 mm2 carrying a current of 1 A.
The resistivity of copper = 1.7 × 10–8 Ω m
Two metallic spheres A and B kept on insulating stands are in contact with each other. A positively charged rod P is brought near the sphere A as shown in the figure. The two spheres are separated from each other, and the rod P is removed. What will be the nature of charges on spheres A and B?
Tick(✓) the correct choice in the following:
Ohm's law is applicable to
Fig. represents the circuit used for the verification of Ohm's law. Label the parts from A to F. state the function of each.
The ratio of the potential difference to the current is known as ________.
The variable resistance is called ____________.
A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively. Which of the following is true?
A heater of 220 V heats a volume of water m 5 mint time. A heater of 110 V heat in ten second. The resistance of the conductor is
Let the resistance of an electrical device remain constant, while the potential difference across its two ends decreases to one fourth of its initial value. What change will occur in the current through it? State the law which helps us in solving the above stated question.
Why should an ammeter have low resistance?
