Question: What Happens To Resistance When Radius Is Doubled?

What is difference between resistance and resistivity?

Resistance is the physical property of a substance because of which it opposes the flow of current i.e.

electrons.

Resistivity is the physical property of a particular substance which is having particular dimensions.

Resistivity is only proportional to the nature and temperature of the particular material..

How does resistance of a wire change with length?

First, the total length of the wires will affect the amount of resistance. The longer the wire, the more resistance that there will be. … In the same manner, the wider the wire, the less resistance that there will be to the flow of electric charge.

What happens to resistance if radius is doubled?

(a) Resistance of a wire is directly proportional to the length of a wire; so if the length is doubled, resistance is also doubled. (b) Resistance of a wire is inversely proportional to the area of cross-section the wire. Thus, if radius is doubled, area increases four times and hence the resistance becomes one-fourth.

How does the resistance of a wire change when its radius is tripled?

1 Answer. Resistance becomes 1/9 th. Resistance becomes 3 times.

What happens to resistance of wire when its length is increased to twice its original length is?

The new resistance of the wire becomes four times its old resistance. The wire’s length is stretched to twice its length i.e. area of cross section decreases or becomes half, since volume remains the same.

How does the resistance of a wire change when its length is tripled and its diameter is doubled?

The resistance of a wire is directly proportional to its length and inversely proportional to its area (or square of inverse of diameter).

What happens to resistance when length is doubled?

Resistance is directly proportional to the length of the wire, and inversely proportional to the cross sectional area of the wire. … Doubling the length will double the resistance, but the wire also must get thinner as it is stretched, because it will contain the same amount of metal in twice the length.

What happens when diameter is doubled?

If we double the diameter, 2D, the radius will also double to 4R. This tells us that if we doubled the original diameter, the radius would also be doubled. The new radius will end up being the same as the original diameter. … So if the diameter of a circle is doubled, then so is the radius of a circle.

How does the resistance change if the diameter is doubled?

Resistance (R) is inversely proportional to Area(A). So if radius is doubled, new area= 4x Area of original wire. So the resistance becomes 1/4th of original value. … If the material and the length of the wire is constant and the diameter doubled then the resistivity will decrease by 4 times.

Does resistance increase with diameter?

Resistance is inversely proportional to the square of the diameter of a wire. If diameter is doubled then resistance is reduced by 4 times.