When a voltage difference is applied to a piece of metal wire, a 10.0 mA current flows through it. If this metal wire is now rep
1 answer:
Answer:
10 mA
Explanation:
We have given when a potential difference is applied then a current of 10 mA is flows so current i = 10 mA
According to ohms law voltage V =i R
And resistance is given as
From the relation it is clear that resistance is inversely proportional to the area
As in new case the wire have twice diameter means 4 times the area so the resistance will decrease by 4 times from the previous resistance
As current current is inversely proportional to resistance so current will become 4 times of previous value
So current = 10×4=40 mA
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Answer:
2. at the lowest point
Explanation:
The motion of the pendulum is a continuous conversion between kinetic energy (KE) and gravitational potential energy (GPE). This is because the mechanical energy of the pendulum, which is sum of KE and GPE, is constant:
E = KE + GPE = const.
Therefore, when KE is maximum, GPE is minimum, and viceversa.
So, the point of the motion where the KE is maximum is where the GPE is minimum: and since the GPE is directly proportional to the heigth of the bob:
we see that GPE is minimum when the bob is at the lowest point,so the correct answer is
2. at the lowest point
