Listrik statik fisika dasar, Lecture notes of Physics Fundamentals

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FISIKA DASAR II FISIKA DASAR II

Oleh :

Mukhtar Effendi

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The electron and proton of a hydrogen atom are separated (on

the average) by a distance of approximately 5.3 x 10

m. Find

the magnitudes of the electric force between the two particles.

Elektron dan proton atom hidrogen terpisah (secara rata-

rata) sejauh 5,3 x 10

m. Hitunglah besarnya gaya listrik

antara dua partikel tersebut.

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Consider three point charges located at the corners of a right triangle

as shown below, where q

= q

= 5.0 C, q

= -2.0 C, and a = 0.

m. Find the resultant force exerted on q

Terdapat tiga buah muatan titik yang terletak pada titik sudut segitiga

sebagaimana terlihat pada gambar, yang q1=q3= 5  C, q2= -2  C dan a =

0,1 m. Hitunglah resultan gaya yang dialami oleh q3.

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A charge q

= 7.0 C is located at the origin, and a second charge q

= -5.0 C is located on the x axis, 0.30 m from the origin. Find the

electric field at the point P , which has coordinates (0, 0.40) m.

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Hukum Gauss

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A proton is released from rest in a uniform electric field that has a magnitude of

8.0 x 10

V/m. The proton undergoes a displacement of 0.50 m in the direction of

E.

(A) Find the change in electric potential between

points A and B.

(B) Find the change in

potential energy of the

proton–field system for

this displacement.

(C) Find the speed of the proton after

completing the 0.50 m displacement

in the electric field.

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An electric dipole consists of two charges of equal magnitude and

opposite sign separated by a distance 2 a , as shown in Figure

below. The dipole is along the x axis and is centered at the origin.

(A) Calculate the electric potential at point P.

(B) Calculate V and Ex at a point

far from the dipole.

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capacitor

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A parallel-plate capacitor with air between the plates has an

area A = 2.00 x 10

m

and a plate separation d = 1.00 mm.

Find its capacitance.

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Capacitors with Dielectrics

A charged capacitor (a) before and (b) after insertion of a dielectric between the

plates. The charge on the plates remains unchanged, but the potential difference

decreases from  V 0 to  V=  V 0 / . Thus, the capacitance increases from C 0 to  C 0.

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A parallel-plate capacitor has plates of dimensions 2.0 cm by

3.0 cm separated by a 1.0-mm thickness of paper ( = 3.7).