Physics
Grade-9
Easy
Question
Study the following graph:
Which statement Is correct with respect to the graph?
- Resistance is directly proportional to the area
- Resistance is inversely proportional to the area
- Resistance is a constant while area changes
- Area is a constant while resistance changes
Hint:
As the cross-sectional area increases, resistance of the conductor decreases.
The correct answer is: Resistance is inversely proportional to the area
Resistance depends on the cross-sectional area of the wire.
It can be proven from the,
R = ρ 
From this, we can conclude that,
R 
Thus, resistance id inversely proportional to the cross-sectional area of the wire.
Related Questions to study
Physics
The length of a certain conductor of resistance 50 ohm is doubled, and its cross-sectional area is halved. Its new resistance is ____.
The length of a certain conductor of resistance 50 ohm is doubled, and its cross-sectional area is halved. Its new resistance is ____.
PhysicsGrade-9
Physics
When current flows through a conductor, the conductor will heat up. If the conductor temperature exceeds the insulation rating of the cable, then the
When current flows through a conductor, the conductor will heat up. If the conductor temperature exceeds the insulation rating of the cable, then the
PhysicsGrade-9
Physics
Low resistivity of a material means
Low resistivity of a material means
PhysicsGrade-9
Physics
What does 'ρ' represent in this equation?
What does 'ρ' represent in this equation?
PhysicsGrade-9
Physics
As the resistance increases, the number of electrons passing through the circuit is affected. What is the effect on the current in the circuit?
As the resistance increases, the number of electrons passing through the circuit is affected. What is the effect on the current in the circuit?
PhysicsGrade-9
Physics
Look at the following graph:
Which statement is false about the graph?
Look at the following graph:
Which statement is false about the graph?
PhysicsGrade-9
Physics
Look at the following table.
The above table gives the resistivity of some common materials used as conductors at a fixed temperature. The worst conductor shown in the table is
Look at the following table.
The above table gives the resistivity of some common materials used as conductors at a fixed temperature. The worst conductor shown in the table is
PhysicsGrade-9
Physics
Look at the following table.
The above table gives the resistivity of some common materials used as conductors at a fixed temperature. The best conductor shown in the table is
Look at the following table.
The above table gives the resistivity of some common materials used as conductors at a fixed temperature. The best conductor shown in the table is
PhysicsGrade-9
Physics
What effect does a hotter temperature have on resistance?
What effect does a hotter temperature have on resistance?
PhysicsGrade-9
Physics
Which offers more resistance?
Which offers more resistance?
PhysicsGrade-9
Physics
A 10 Ω resistor is to be made from manganin wire with a cross-sectional area of 0.2 mm2 . If manganin has a resistivity of 48 ×10-8 Ohm-m, then the required length of this size manganin wire will be:
A 10 Ω resistor is to be made from manganin wire with a cross-sectional area of 0.2 mm2 . If manganin has a resistivity of 48 ×10-8 Ohm-m, then the required length of this size manganin wire will be:
PhysicsGrade-9
Physics
A copper cable has a length of 450 m and a cross-sectional area of 4.0 mm2. If the resistivity of the copper is 1.72 ×10-8 Ohm-m, then the resistance of this cable will be:
A copper cable has a length of 450 m and a cross-sectional area of 4.0 mm2. If the resistivity of the copper is 1.72 ×10-8 Ohm-m, then the resistance of this cable will be:
PhysicsGrade-9
Physics
The resistance of a material is most determined by four factors – length, cross-sectional area, type of material and _____.
The resistance of a material is most determined by four factors – length, cross-sectional area, type of material and _____.
PhysicsGrade-9
Physics
Resistance does not depend upon
Resistance does not depend upon
PhysicsGrade-9
Physics
Resistance can be described as the
Resistance can be described as the
PhysicsGrade-9
