# UH PHYS 1302 - Exam 1 Spring 2014_DasPhysics1302 (5 pages)

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## Exam 1 Spring 2014_DasPhysics1302

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## Exam 1 Spring 2014_DasPhysics1302

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old practice exam 1

Pages:
5
School:
University of Houston
Course:
Phys 1302 - Introductory to Physics II
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Physics 1302 Exam 1 Professor Mini Das Type Group 1 1 Three point charges are placed on the x axis A charge of 2 0 C is placed at the origin 2 0 C to the right at x 50 cm and 4 0 C at the 100 cm mark What are the magnitude and direction of the electrostatic force which acts on the charge at the origin A 0 072 N towards right B 0 072 N towards left C 0 143N toward left D 0 143N towards right 2 An atomic nucleus has a charge of 40e An electron is 10 9 m from the nucleus What is the force on the electron A 3 7 nN B 9 2 nN C 1000 C D 6 8 nN E 2 9 nN 3 A charged rod carrying a negative charge is brought near two spheres that are in contact with each other but insulated from the ground If the two spheres are then separated what kind of charge will be on the spheres A The spheres do not get any charge B The sphere near the charged rod becomes negative and the other becomes positive C The sphere near the charged rod becomes positive and the other becomes negative D None of the other choices is correct 4 Two point charges of 20 0 C and 8 00 C are separated by a distance of 20 0 cm What is the intensity of electric field E midway between these two charges A 25 2 105 N C directed towards the positive charge B 25 2 104 N C directed towards the negative charge C 25 2 105 N C directed towards the negative charge D 25 2 106 N C directed towards the negative charge E 25 2 106 N C directed towards the positive charge 5 5 A styrofoam ball of mass 0 120 g is placed in an electric field of 6000 N C pointing downward What charge must be placed on the ball for it to be suspended A 18 0 nC B 57 2 nC C 16 0 nC D 125 nC E 196 nC 6 Consider the x axis with 4 0 C at x 1 0 meter and 2 0 C at the origin Where should 6 0 C be placed so that the net force on it is zero A 2 4 m B 2 4 m C 5 m D 5m 7 A 5 0 C charge is moved from a negative to a positive plate of a parallel plate capacitor In moving this charge 0 30 mJ of energy is used What is the potential difference between the plates of this capacitor A 23 V B 0 V C 55 V D 81 V E 60 V 8 A parallel plate capacitor with plate separation of 4 0 cm has a plate area of 6 0 10 2 m2 What is the capacitance of this capacitor if a dielectric material with a dielectric constant of 2 4 is placed between the plates A 16 10 14 F B 3 7 10 12 F C 32 10 12 F D 3 7 10 14 F E 32 10 14 F 9 A 4 0 C charge is situated at the origin of an xy coordinate system What is the potential difference between a point x 4 0 m and y 2 0 m because of this charge A 9 0 103 V B 9 0 103 V C 36 103 V D 0 V E 36 103 V 10 10 An electron initially at rest is accelerated through a potential difference of 550 V What is the speed of the electron due to this potential difference A 13 9 106 m s B 18 7 106 m s C 6 10 106 m s D 1 44 106 m s E 1 59 106 m s 11 A 200 W light bulb is connected across 110 V What current will flow through this bulb A 0 A B 0 90 A C 0 60 A D 1 8 A E 0 36 A 12 A 4 resistor is connected in parallel with a 12 resistor and this combination is connected to a DC power supply with voltage V as shown below If the total current in this circuit is 2 A what is the value of voltage V A 3 V B 2 V C 1 5 V D 6 V E None of the other answers is correct 13 Three capacitors are connected as shown below What is the equivalent capacitance between points A and B A 7 1 F B 12 F C 8 0 F D 1 7 F E 4 0 C 14 A light bulb operating at a voltage of 120 V has a resistance of 200 What is the power A 7 2 W B 72 W C 100 W D 14 10 3 W E 60 W 15 The resistance of a 100 cm wire of cross sectional area 2 10 6 m2 is 400 What is the resistivity of the material of this wire A 0 8 10 5 m B 8 10 6 m C 0 8 10 6 m D 8 10 4 m E 0 8 10 4 m 16 Three resistors of values 2 6 and 12 are connected across a DC voltage source as shown below If the total current through the circuit is 2 0 A what is the applied voltage A 6 0 V B 1 5 V C 2 7 V D 2 0 V E 3 0 V 17 A proton moving eastward with a velocity of 5 0 103 m s enters a magnetic field of 0 20 T pointing northward What is the magnitude and direction of the force that acts on the proton A 0 N B 1 1 10 16 N eastwards C 4 4 10 16 N westwards D 1 6 10 16 N upwards E 1 6 10 16 N downwards 18 Two long parallel wires carry currents of 20 A and 5 0 A in opposite directions The wires are separated by 0 20 m What is the magnetic field midway between the two wires A 2 0 10 5 T B 4 0 10 5 T C 1 0 10 5 T D 3 0 10 5 T E 5 0 10 5 T Mass Spectrometer An ion enters a mass spectrometer which has a 0 18 Tesla field perpendicular to an electric field of 1 6 kV m and selects a velocity The same magnetic field is then used to deflect the singly charged ion into a circular path of radius 12 5 cm 19 What velocity was selected A 8 9 km s B 18 km s C 4 5 Km s D Not enough information provided 20 What was the ion mass A 4 1x10 25 Kg B 2 1x10 24 Kg C Not enough information provided

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