Universitas Jenderal Soedirman Purwokerto FISIKA DASAR II Oleh : Mukhtar Effendi.

Presentasi berjudul: "Universitas Jenderal Soedirman Purwokerto FISIKA DASAR II Oleh : Mukhtar Effendi."— Transcript presentasi:

1 Universitas Jenderal Soedirman Purwokerto FISIKA DASAR II Oleh : Mukhtar Effendi

2 Universitas Jenderal Soedirman Purwokerto Ilmu Fisika Mukhtar Effendi Ilmu Fisika 2

3 Universitas Jenderal Soedirman Purwokerto Ilmu Fisika Mukhtar Effendi Ilmu Fisika 3 Coulomb’s Law

4 Universitas Jenderal Soedirman Purwokerto Ilmu Fisika Mukhtar Effendi Ilmu Fisika 4 The electron and proton of a hydrogen atom are separated (on the average) by a distance of approximately 5.3 x 10 -11 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 -11 m. Hitunglah besarnya gaya listrik antara dua partikel tersebut.

5 Universitas Jenderal Soedirman Purwokerto Ilmu Fisika Mukhtar Effendi Ilmu Fisika 5 Consider three point charges located at the corners of a right triangle as shown below, where q 1 = q 3 = 5.0  C, q 2 = -2.0  C, and a = 0.10 m. Find the resultant force exerted on q 3. 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.

6 Universitas Jenderal Soedirman Purwokerto Ilmu Fisika Mukhtar Effendi Ilmu Fisika 6 The Electric Field the electric field vector E at a point in space is defined as the electric force Fe acting on a positive test charge q 0 placed at that point divided by the test charge:

7 Universitas Jenderal Soedirman Purwokerto Ilmu Fisika Mukhtar Effendi Ilmu Fisika 7 A charge q 1 = 7.0  C is located at the origin, and a second charge q 2 = -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.

8 Universitas Jenderal Soedirman Purwokerto Ilmu Fisika Mukhtar Effendi Ilmu Fisika 8 Hukum Gauss

9 Universitas Jenderal Soedirman Purwokerto Ilmu Fisika Mukhtar Effendi Ilmu Fisika 9 the electric potential created by a point charge at any distance r from the charge is the potential energy of the system Obtaining the Value of the Electric Field from the Electric Potential

10 Universitas Jenderal Soedirman Purwokerto Ilmu Fisika Mukhtar Effendi Ilmu Fisika 10 A proton is released from rest in a uniform electric field that has a magnitude of 8.0 x 10 4 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.

11 Universitas Jenderal Soedirman Purwokerto Ilmu Fisika Mukhtar Effendi Ilmu Fisika 11 An electric dipole consists of two charges of equal magnitude and opposite sign separated by a distance 2a, 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.

12 Universitas Jenderal Soedirman Purwokerto Ilmu Fisika Mukhtar Effendi Ilmu Fisika 12 (C) Calculate V and Ex if point P is located anywhere between the two charges.

13 Universitas Jenderal Soedirman Purwokerto Ilmu Fisika Mukhtar Effendi Ilmu Fisika 13 capacitor

14 Universitas Jenderal Soedirman Purwokerto Ilmu Fisika Mukhtar Effendi Ilmu Fisika 14 A parallel-plate capacitor with air between the plates has an area A = 2.00 x 10 4 m 2 and a plate separation d = 1.00 mm. Find its capacitance.

15 Universitas Jenderal Soedirman Purwokerto Ilmu Fisika Mukhtar Effendi Ilmu Fisika 15 Combinations of Capacitors

16 Universitas Jenderal Soedirman Purwokerto Ilmu Fisika Mukhtar Effendi Ilmu Fisika 16 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.

17 Universitas Jenderal Soedirman Purwokerto Ilmu Fisika Mukhtar Effendi Ilmu Fisika 17 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).