How much negative charge has been removed from a positively charged electroscope if it has a charge of 7.5x10-11C?
If C is Coulombs then, −1 C is equivalent to the charge of approximately 6.242×10^18 electrons.
You already gave the answer: -7.5x10–11C
It is like asking: What colour is my white horse?
Now if you want to know how many electrons have been removed, then multiplying the number of electrons in a coulomb by the coulombs you have, you get 4.6815 x 10^8 electrons. Which is almost the same answer as before.
There is no image!?...was there meant to be something attached?
Answer:
Torque decreases .
Explanation:
The tape is pulled at constant speed , speed v is constant , so there is
v = ω r where ω is angular speed and r is radius , As radius decreases , angular speed ω increases , So there is angular acceleration .
Let it be α . Let I be moment of inertia of reel .
Reel is in the form of disc
I = 1/2 m r²
I x α = torque
1/2 m r² x α = torque
As the reel is untapped , its mass decreases , r also decreases , so torques also decreases .
Answer:
It is made up of iron, steel or any other ferromagnetic substance or ferromagnetic composite, having permanent magnetic properties. The magnet has two poles: a north and a south pole. When you suspend it freely, the magnet aligns itself so that the north pole points towards the magnetic north pole of the earth.
Answer:
It is moving from 4s to 8s at a constant speed of 4 cm/s
Explanation:
The graph would show a line with a positive gradient, this would mean that the speed would increase as more time passed. This means that it was accelerating from 0s to 4s. Thus this disproves the first option.
For the second option, we know that this is a speed time graph, so a horizontal line would symbolise constant speed. Therefore, it wouldn't be at rest and also makes the third option correct.
For the last option, the first part is correct in saying that it is 'speeding up' as we do see the speed increase due to the positive gradient. However, from the previous option (which is correct) we know that it isn't at rest and is moving at constant speed. Therefore, the last one is wrong.
And thus, the only correct option is option 3.