What is a
2 answers:
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Answer:
Option B is correct.
Explanation:
The resistance of a material or wire is represented by the formula below.
R=(ρL)/A
where
- R is resistance of wire
- ρ is the resistivity of the material
- A is the cross sectional area of wire
- L is length of wire
Resistance increases with increase in length and resistivity which means options C and D are wrong.
A=(π)/4
An increase in diameter will result in a proportional increase in area
From the resistance formula, an increase in area will cause a reduction in the resistance of the material.Thus increased diameter of wire will lower the resistance of wire. Option B is correct
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Answer:
Explanation:
The torque equation is given by:
Where:
- I is the current
- A is the area of the loop (A=πR²)
- θ is the angle between the normal vector of A and B, in this case it is 90 degrees
So:
Therefore the torque is:
I hope it helps you!