A non-contact force is a force which acts on an object without coming physically in contact with it. In contrast a contact force is a force which acts on an object coming physically in contact with it. ...
If there was any way to do that, then your teacher wouldn't
need to keep you coming into class every day and doing
homework every night. She could just give you the 3 or 4
paragraphs and a few pictures that you're asking me for,
and bada-bing ! you'd know it !
The time it takes, and the amount of homework it takes, is
EXACTLY the time you spent hearing about it in class.
(Unless you're some kind of genius savant prodigy, which
you're not and I'm not.)
Answer:
Language -English plz I cant understand
Answer:
k = 6.72
Explanation:
K of paper = 3.7
k of air = 1
Given that charge Q on the capacitor is constant because cell is disconnected from the circuit. So
V = Q / C = 2.5
Capacity becomes C / 3.7 in air .
capacity becomes C/3.7 when paper is replaced by air .
V₁ = Q / (C/3.7)
= 3.7 Q/C
3.7 x 2.5
= 9.25 V
In the second case ,
capacitance due to new unknown dielectric k
= C/3.7 x k
= kC / 3.7 ( Capacitance in air is C/3.7 )
V ( new ) = Q / ( kC/3.7 )
= 3.7 Q/kC
.55 x 2.5 = 3.7 x( 2.5 / k )
k = 3.7 / .55
= 6.72
Answer:
That depends a bit on what we are charging. Some examples follow...
Explanation:
If the device being charged is just an ordinary insulator (like a balloon rubbed in your hair), what happens is that electrons from you hair transfer onto the balloon, but only act the point of contact. (This is what it means for a substance to be an insulator - charge applied remains at the location it was placed, without moving.)
If we are talking about charging a capacitor, charge from a battery accumulates on the negative plate of the capacitor and by induction, electrons are repelled from the opposite plate, resulting in a positive charge on that plate.
If it is recharging of a battery, the electrons that are supplied to the cathode of the battery cause a chemical process to occur (called reduction) on the surface of the electrode. This reverses the reaction that occurred during the discharge of the battery, and the battery is then ready to deliver current once again.