Advertisements
Advertisements
प्रश्न
A 10 m long wire of a particular material is of resistance 5Ω What will be the resistance if the wire is doubled itself.
उत्तर
Given: The resistance of 10 m long wire = 5 Ω
On doubling the wire on itself the length is reduced to half and the area of cross-section is doubled so the resistance is reduced to one-fourth i.e. the resistance of the wire will become:
`1/4 xx 5 Omega = 1.25 Omega`
APPEARS IN
संबंधित प्रश्न
What is a voltmeter?
Name a device which helps to maintain potential difference across a conductor (say, a bulb).
In the circuit diagram given below, the current flowing across 5 ohm resistor is 1 amp. Find the current flowing through the other two resistors.
Explain the statement ‘the potential difference between two points is 1 volt’.
Explain the analogy between the flow of charge (or current) in a conductor under a potential difference with the free fall of a body under gravity.
Find the resistance of a conductor if the electric current flowing through it is 0.35 A when the potential difference across it is 1.4 V.
Which one of the following is the correct set-up for studying the dependence of the current on the potential difference across a resistor and why?
Draw a graph of Potential difference (V) versus Current (I) for an ohmic resistor. How can you find the resistance of the resistor from this graph?
Three resistors are connected to a 6 V battery as shown in the figure given below:
Calculate:
(i) the equivalent resistance of the circuit.
(ii) total current in the circuit.
(iii) potential difference across the 7.2 Ω resistor.
A boy records that 4000 joules of work are required to transfer 10 coulombs of charge between two points of a resistor of 50 Ω. The current passing through it is:
