1. An electric field E ? =( 1.0Ý10 5 N/C , right ) causes the 5.0 g ball in the
ID: 2138227 • Letter: 1
Question
1. An electric field E? =( 1.0Ý105N/C , right ) causes the 5.0 g ball in the figure to hang at a 20? angle
What is the charge on the ball
http://session.masteringphysics.com/problemAsset/1169225/2/jfk.Figure.20.P65.jpg
2. An electric dipole is formed from ± 1.0nC point charges spaced 1.0mm apart. The dipole is centered at the origin, oriented along the y-axis.
What is the electric field strength at point (x,y) = ( 6.0cm ,0cm)?
What is the electric field strength at point (x,y) = (0cm, 6.0cm )?
3. Two 3.00cm Ý 3.00cm plates that form a parallel-plate capacitor are charged to ± 0.708nC
What is the electric field strength inside the capacitor if the spacing between the plates is 1.00mm ?
What is potential difference across the capacitor if the spacing between the plates is 1.00mm ?
What is the electric field strength inside the capacitor if the spacing between the plates is 2.00mm ?
What is the potential difference across the capacitor if the spacing between the plates is 2.00mm ?
4. A 3.0cm Ý 3.0cm parallel-plate capacitor has a 3.0mm spacing. The electric field strength inside the capacitor is 1.2Ý105V/m .
What is the potential difference across the capacitor?
How much charge is on each plate?
An electric field E? =( 1.0A 105N/C , right ) causes the 5.0 g ball in the figure to hang at a 20? angle What is the charge on the ball An electric dipole is formed from A plusminus 1.0nC point charges spaced 1.0mm apart. The dipole is centered at the origin, oriented along the y-axis. What is the electric field strength at point (x,y) = ( 6.0cm ,0cm)? What is the electric field strength at point (x,y) = (0cm, 6.0cm )? Two 3.00cm A 3.00cm plates that form a parallel-plate capacitor are charged to A plusminus 0.708nC What is the electric field strength inside the capacitor if the spacing between the plates is 1.00mm ? What is potential difference across the capacitor if the spacing between the plates is 1.00mm ? What is the electric field strength inside the capacitor if the spacing between the plates is 2.00mm? What is the potential difference across the capacitor if the spacing between the plates is 2.00mm ? A 3.0cm A 3.0cm parallel-plate capacitor has a 3.0mm spacing. The electric field strength inside the capacitor is 1.2A 105V/m. What is the potential difference across the capacitor? How much charge is on each plate?Explanation / Answer
1)
T*sin(20) = q*E --(1)
T*cos(20) = m*g --(2)
(1)/(2) ==> tan(2) = q*E/m*g
q = m*g*tan(20)/E = 1.783*10^-7C
2)
3) C = A*epsilon/d
V = Q/c
a)E*d = Q*d/(A*epsilon)
E = Q/(A*epsilon) = 8.885*10^4 N/C
b)v = E*d = 88.85 volts
c)same, E = Q/(A*epsilon) = 8.885*10^4 N/C
d)v = E*d = 177.7 volts
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