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Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Journal : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

ANALISA PENGARUH KETEBALAN LEMPENGAN BESI (Fe) TERHADAP INDUKSI MAGNETIK YANG DITIMBULKAN OLEH BEBERAPA MEREK TELEPON SELULER Noprianti, Ikrah; ', Erwin; ', Salomo
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

Nowadays, a cellular telephone is predicted to generate the effect of electromagnetic radiation on the users. In this research, the measurement of magnetic induction generated by three cellular telephones (sample A, B and C) was demostrated. The measurement was performed in two directions namely horizontal and vertical directions. In order to measure the magnetic induction, was used a Pasco magnetic probe 2162. The magnetic induction in the horizontal direction was measured with the distance of 0,5 cm from the cellular telephone. The effect of a slab of iron with various thicknesses namely 1-4 mm on magnetic induction was also studied. The results of this research showed that the value of magnetic induction generated by the cellular telephone sample A is the highest among brand B and C with the value of 7.73300x10-4 Tesla and followed by sample B and C with the value of 3.6241x10-4 Tesla and 1.41615x10-4 Tesla respectively. The value of magnetic induction in vertical direction decreases very significantly with the distance. Moreover, the magnetic induction increases when a slab of iron with the thickness of 1 mm to 4 mm was introduced.
ANALISA PENGARUH INTI KOIL TERHADAP MEDAN MAGNETIK DAN MUATAN PADA KAPASITOR DALAM RANGKAIAN SERI LC Wahyuni, Sri; ', Erwin; ', Salomo
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

Magnetic field that produced by coils changes its value significantly when the coil core made from air replaced by ferromagnetic (Fe), paramagnetic (Cu) and diamagnetic (Al) materials. In this research the value of magnetic field was measured as a function of coil’s turns (N), applied current (I) and the distance from the center of the coil as the coil’s core changed from air to Fe, Cu and Al. Number of turns of the coils was varied namely 50, 100, and 150 with the length of 4.2 cm and diameter of 3.2 cm. Next, the coil and a capacitor were connected with a series circuit in which the value of the capacitance of the capacitor was 4700 μƒ. Magnetic field that produced by the coils were measured using Pasco magnetic probe PS-2162.While the voltage were measured using volt meter. From the result of the research it was found that the average value of magnetic field (N = 50 turns) for constant current of (2A) increased by 127% and 13.59 % when the core coil (air) was replaced by iron and copper respectively. While for aluminum, the value of the magnetic field was reduced by 45.56 % from air core. Theoretically, the value of charges on the capacitor and current flow in the circuit as a function of time oscillated in the form of sinusoidal. The charges on the capacitor at t=0 had its maximum value that was 9.4 x 10-4 Coulomb, The current in the circuit reached its maximum value that was 5.08 Ampere at t = 10 s.
PENGARUH KETEBALAN BAHAN ALUMINIUM TERHADAP INDUKSI MAGNETIK YANG DITIMBULKAN OLEH TELEPON SELULER Kusma, Lendra; ', Erwin; ', Salomo
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

Nowadays, a cellular phone is an important communication tool therefore, biologically the electromagnetic radiation produced from the cellular phone on the users become relevant. The measurement of magnetic induction generated by three brands namely A, B and C of cellular phone was carried out. The measurement was done for two directions such as horizontal and vertical direction. In order to investigate the effect of alumunium thickness on magnetic induction, several slabs of alumunium with the thichness of 1 mm – 4 mm were prepared. An instrument used for measuring the magnetic induction was magnetic sensors Pasco 2162. The magnetic induction was measured in horizontal direction at a distance of 0,5 cm from cellular phone with and without using an aluminium slab. The results showed that the magnetic induction in horizontal direction generated by cellular phone brand A is highest among A, B and C with the value of 1,09x10-4 Tesla, 1,07x10-4 Tesla, 9,75x10-5 Tesla respectively. The value of magnetic induction generated by a cellular phone reduces when a slab of alumunium was inserted between cellular phone and sensor. The measurement of the magnetic induction in a vertical direction shows that the further distance of the sensor to the cellular phones and the smaller the magnetic induction observed. The result also showed that the value of magnetic dipole moment of cellular phone based on the plot of magnetic induction versus distance is 1 Am2.
DESAIN PEMBUATAN DAN UJI COBA KUMPARAN HELMHOLTZ BERBENTUK LINGKARAN Ardiyani, Ginisa; ', Erwin; ', Salomo
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

Design and study  of Helmholtz coils have been carried out.  The coils  diameter was designed of about    13 cm and  number of turns of    50, 100, 150, 200 and 250. Magnetic field that produced by those coils was measured using  pasco  magnetic probe PS-2162 as a function of an applied current, distances and number of turns. As comparison,  then the magnetic field produced by these coils had been compared to the standard one.  Maximum value of magnetic field was obtained at the center of the coil. For an applied current of 2 A, then the magnetic field at the center of the coils either  standard one  or the designed one  was  7.156 x 10-5T  and 5.907  x 10-5T respectively. The value of magnetic field increases as number of turns and current are increased, for the coils with number of turns of 50 and 250 that carrying current of 1.0 A  produced a magnetic field of  5.241 x 10-5T and 6.208 x 10-5T respectively. This is due to the direct relationship between current (I) and number of turns (N) against magnetic field as expected. The value of magnetic field decreases as moving away from the center of coil either in horizontal or vertical direction.