Advertisements
Advertisements
Question
A wire has a length of 2.0 m and a resistance of 5.0 Ω. Find the electric field existing inside the wire if it carries a current of 10 A.
Advertisements
Solution
Given:-
Length of the wire, l = 2 m
Resistance of the wire, R = 5 Ω
Current through the wire, i = 10 A
From Ohm's Law, the potential difference across the wire,
V = iR
∴ V= 10 × 5 = 50 V
Electric field,
\[E = \frac{V}{l}\]
\[ = \frac{50}{2}\]
\[ = 25 V/m\]
APPEARS IN
RELATED QUESTIONS
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
Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?
The relationship between the potential difference and the current in a conductor is stated in the form of a law.
1) Name the law.
2) What does the slope of V-I graph for a conductor represent?
3) Name the material used for making the connecting wire.
How should the two resistances of 2 ohms each be connected so as to produce an equivalent resistance of 1 ohm?
Four resistances of 16 ohms each are connected in parallel. Four such combinations are connected in series. What is the total resistance?
In a conductor 6.25 × `10^16` electrons flow from its end A to B in 2 s. Find the current flowing through the conductor (e = 1.6 × `10^-19` C)
Consider the sacle of voltmeter shown in the diagram and answer the following questions :
(a) What is the least count of the voltmeter?
(b) What is the reading shown by the voltmeter ?
(c) If the voltmeter is connected across a resistor of 20 `Omega` how much current is flowing through the resistor?
Define the following:
Coulomb
What is meant by the drift speed of free electrons?
State the relation correlating the electric current flowing in a conductor and the voltage applied across it. Also, draw a graph to show this. relationship.
The ratio of the potential difference to the current is known as ________.
State Ohm’s law.
Define temperature coefficient of resistance.
The resistance of a nichrome wire at 0°C is 10Ω. If its temperature coefficient of resistivity of nichrome is 0.004/ °C, find its resistance of the wire at boiling point of water. Comment on the result.
State Ohm’s law? How can it be verified experimentally? Does it hold good under all conditions? Comment.
Calculate the total resistance of the circuit and find the total current in the circuit.
The resistance of a resistor is reduced to half of its initial value. If other parameters of the electrical circuit remain unaltered, the amount of heat produced in the resistor will become ______.
