Advertisements
Advertisements
प्रश्न
A 10 m long wire of a particular material is of resistance 5Ω What will be the resistance of 10m long wire of the same material but the double radius.
Advertisements
उत्तर
Given: The resistance of 10 m long wire = 5 Ω
For the wire of double the radius, the area of cross-section (a = πr2) of wire will be four times that of previous wire. Since resistance R α `1/"a"`. So the resistance of new wire will be one-fourth of the previous wire i.e., it will be `1/4 xx 5 Omega = 1.25 Omega`
संबंधित प्रश्न
How much work is done when one coulomb charge moves against a potential difference of 1 volt?
A p.d. of 10 V is needed to make a current of 0.02 A flow through a wire. Wire p.d. is needed to make a current of 250 mA flow through the same wire?
How is the electric potential difference between the two points defined? State its S.I. unit.
How does the resistance of a metallic wire depend on its temperature? Explain with reason.
Calculate the potential difference between the two terminals of a battery if 100 joules of work is required to transfer 20 coulombs of charge from one terminal of the battery to the other.
Suppose there are three resistors A, B, and C having resistances r1, r2, and r3 respectively. If R represents their equivalent resistance, establish the following relation `1/"R" = 1/"r"_1 + 1/"r"_2 + 1/"r"_3`, when joined in parallel.
A 10 m long wire of a particular material is of reistance 5Ω What will be the resistance of 5m long wire of same material and the same thickness.
Assertion (A): Charges flow from higher potential to lower potential.
Reason (R): Current flows mainly due to the flow of electrons.
Two charged spherical conductors of radius R1 and R2 are connected by a wire. Then the ratio of surface charge densities of the spheres (σ1/σ2 ) is ______
Twenty-seven drops of same size are charged at 220 V each. They combine to form a bigger drop. Calculate the potential of the bigger drop.
