Will increasing length and cross-sectional area increase the resistance of an object?
1 answer:
Answer:
Increasing length increases resistance
increasing cross sectional area reduces the resistance
.
Explanation:
The formula for resistance of an object is
where r is resistance, d is resistivity of the material, l is length of material and a is cross sectional area of the object. This equation shows us that resistance is directly proportional to length and inversely proportional to cross sectional area. Hence, increasing length increases resistance while increasing cross sectional area reduces the resistance.
If these 2 variables are varied to the same extent, the net effect can be zero on the resistance.
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Explanation:
It is given that,
Force applied to object,
Position,
(b) The cross product of force and position vector is used to find the net torque about the z axis. It is given by :
or
The torque is acting in -z axis.
(a) The magnitude of torque is given by :
Hence, this is the required solution.