# UMass Amherst PHYSICS 132 - Physics 132 Unit 4 HW (2 pages)

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## Physics 132 Unit 4 HW

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## Physics 132 Unit 4 HW

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Pages:
2
School:
University of Massachusetts Amherst
Course:
Physics 132 - Intro Physics II
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1 How many coulombs of positive charge are contained in the atomic nuclei of this gas You have 5 0 mol of O 2 gas Using Avogadro s Number first we calculate 6 02e23 particles 5 0 mol 3010000000000000000000000 particles So O 2 gas is 8 protons in a 1 mol single atom Oxygen is diatomic though so O 2 gas will have 16 protons 16 protons 3010000000000000000000000 1 particle 48160000000000000000000000 protons 48160000000000000000000000 1 602e 19 Coulombs 1 proton 7715232 Coulombs or 7 715232e 15 nC 2 A plastic rod that has been charged to 15 0 nC touches a metal sphere Afterward the rod s charge is 10 0 nC Wha t kind of charged particle was transferred between the rod and the sphere An electron In which direction was the charged particle transferred between rod and sphere That is did it move from the rod to the sphere or from the sphere to the rod It moved from rod to sphere How many charged particles were transferred 15 0 nC 5 nC transferred 10 0 nC Coulombs 5nC 11e 9 nano Coulombs 0 000000005 Coulombs 0 000000005 Coulombs 1 electrons 1 602e 19 Coulombs 31210986267 1660424469413233458177278 electrons 3 125 e 10 3 A piece of plastic has a net charge of 2 00 C How many more protons than electrons does this piece of plastic have e 1 60 10 19 C 1 25e13 4 Electrically neutral o bjects cannot exert an electrical force on each other but they can exert a gravitational force on each other False 5 A 30 nC charge experiences a 0 032 N electric force What is the magnitude of electric field at the position of this charge 0 032 30 10 9 1066666 6666666666666667 6 A protein molecule in an electrophoresis gel has a negative charge The exact charge depends on the pH of the solution but 30 excess electrons is typical What is the magnitude of the electric force on a protein with this charge in a 1700 N C electric field F Eq 1700N C 30 1 60x10 19 C 0 00000000000000816 7 Large electric fields in cell membranes cause ions to move through the cell wall The field strength in a typical membrane is 1 0 107N C What is the magnitude of the force on a calcium ion with charge e Required Force 1 0 10 1 6 10 1 6 10 N 8 A proton is placed in an electric field of intensity 800 N C What are the magnitude and direction of the acceleration of the proton due to this field e 1 60 10 19 C m proton 1 67 10 27 kg 7 66 10 10 m s 2 in the direction of the electric field 9 A particle with a charge of 4 0 C has a mass of 5 0 g What magnitude electric field directed upward will exactly balance the weight of the particle 1 2 10 4 N C 10 A 10 nC charge sits at a point in space where the magnitude of the electric field is 1300 N C What will the magnitude of the field be if the 10 nC charge is replaced by a 20 nC charge Assume the system is big enough to consider the charges as small test charges 1300N C 11 What magnitude charge creates a 1 0 N C electric field at a point 1 0 m away E K x q d 2 then K 9 x 10 9 N m 2 C 2 then E 1 0 then q E x d 2 K then 1 x 1 2 9 x 10 9 and finally 0 11 x 10 9 C 0 11 12 What is the strength of the electric field 3 0 cm from a small glass bead that has been charged to 5 0 nC It is E F Q kQ r then 8 99e9 5e 9 0 03 49944 44 N C and then What is the direction of the electric field 3 0 cm from a small glass bead that has been charged to 5 0 nC away from the bead 13 What is the strength of the electric field Ep 7 0 mm from a proton E kQ r N C or V m then E 9 0E9 1 60E 19 7 0E 3 9 0E 5 N C direction radially outward from p then 0 000029387755102040816327 is the answer What is the direction of the electric field E p 7 0 mm from a proton Away from the proton What is the strength of the electric field E e 7 0 mm from an electron 0 000029387755102040816327 but What is the direction of the electric field Ee 7 0 mm from an electron Toward the electron 14 A 19 nC charge is located at the origin What is the strength of the electric field at the position x y 5 0cm 0cm E kq r kq x y then Wha t is the strength of the electric field at the position x y 5 0cm 5 0cm 8 988e9 19e 9 0 05 0 05 34 153 N C then What is the strength of the electric field at the position x y 5 0cm 5 0cm 8 988e9 19e 9 0 05 0 05 34 153 N C

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