# electric field intensity

posted by .

Two 2.0 g spheres are suspended by 10.0 cm long light strings. A uniform electric field is applied in the x direction. If the spheres have charges of -5.0 10-8 C and +5.0 10-8 C, determine the electric field intensity that enables the spheres to be in equilibrium at = 10°.

• electric field intensity -

Mass of sphere = 2*10^-3 kg
Weight of sohere = 9.8*2 *10^-3 = 1.96 *10^-2 N
Force to hold at 10deg = 1.96*10^-2 * tan 10
= 3.45 *10^-3 N
= E * q
so
E = 3.45 *10^-3 / 5 *10^-8

• electric field intensity -

6.91*10^4 N/C

• electric field intensity -

F:Static electricity force which the sphere receives
F=qE＋kq^2/r^2
(r=8*10^(-2)×sin11°×2)
sin11°=0.190

the weight of the sphere: mg
(=3*10^(-3)×9.8N)

F/mg=tan11°(=0.194)
F=tan11°*mg
qE－kq^2/r^2= tan11°*mg
E=kq/r^2＋tan11°*mg/q

＝2.90*10^5＋1.90*10^5
=4.80*10^5(N/m)

## Similar Questions

1. ### Physics-Gauss' Law, hard

Thank you Damon for answering my first questions fast and accurately. Do you or anybody else know how to do these harder Gauss' Law Problems?
2. ### Physics

An electron moving to the right at 3.0% the speed of light enters a uniform electric field parallel to its direction of motion. If the electron is to be brought to rest in the space of 4.5 cm, determine the following. What direction …
3. ### physics

Two 4.0-g spheres are suspended by 9.0-cm-long light strings (see the figure). A uniform electric field is applied in the x-direction. If the spheres have charges of −3. 10-8 C and +3. 10-8 C, determine the electric field intensity …
4. ### College Physics

An electric dipole consists of 2.0 g spheres charged to 5.0 nC (positive and negative) at the ends of a 12 cm long massless rod. The dipole rotates on a frictionless pivot at its center. The dipole is held perpendicular to a uniform …
5. ### college physics

An electric dipole consists of 2.0 g spheres charged to 5.0 nC (positive and negative) at the ends of a 12 cm long massless rod. The dipole rotates on a frictionless pivot at its center. The dipole is held perpendicular to a uniform …
6. ### physics!

An electric dipole consists of 2.0 g spheres charged to 5.0 nC (positive and negative) at the ends of a 12 cm long massless rod. The dipole rotates on a frictionless pivot at its center. The dipole is held perpendicular to a uniform …
7. ### Physics

Consider three conducting spheres each 10 cm in diameter. “A” has a net charge of 5 C, “B” has a net charge of 10 C, and “C” has a net charge of zero, but is placed in an electric field of 1000 V/m. Rank the electric field …
8. ### PHYSICS

1. Why is an electric field considered to be a vector quantity?
9. ### physics

Which of the following statements about electric field lines due to static charges are true?
10. ### Chemistry

Two fixed charges, -4μC and -5μC, are separated by a certain distance. If the charges are separated by 20cm, what is the magnitude of the electric field halfway between the charges?

More Similar Questions