Name-Surname : Number : Department : Signature : FİZ 144 physics II 2005-2006 summer semester midterm II
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2006-yaz-fiz144-ara2-m
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MMMMM Name-Surname : Number : Department : Signature : FİZ 144 PHYSICS II 2005-2006 SUMMER SEMESTER MIDTERM II 08.08.2006 The duration of the exam is 100 minutes. There are 30 questions with equal weight in this exam. This question booklet is type “M” booklet. Use the appropriate box in the answer page. Five wrong answers nullify a correct answer. If need be, use the back page of the booklet for calculation. Please fill in identity information both the booklet and answer sheet. It is not allowed to use calculator. GIVENS e=1.6x10-19 C g=10 m/s2 k=(1/40)=9x109 N.m2/C2 o=9x10-12 C2/N.m2 109 giga G o=4x10-7 T.m/A 106 mega M =3 103 kilo k mp =1.7x10-27 kg 10-2 centi cm me=9x10-31 kg 10-3 mili m 1 eV=1.6x10-19 J 10-6 micro sin30o=cos60o=0.5 10-9 nano n cos30o=sin60o=0.87 10-12 pico p sin45o= cos45o=0.7 cos37o=0.8 sin37o=0.6 ln 2=0.7; e=2.7 log e = 0.43
A wire of 50 cm long lying along the x-axis carries a current of 0.1 A in the positive x-direction, through a magnetic field B=0.3 j + 0.1 k (T). Find the force (in mN) on the wire. A) -5 j + 15 k B) 25 i + 75 j C) 5 j – 15 k D) –25 j + 75 k E) –15 j + 35 k 
A circular loop of wire of radius r lies in the yz plane and carries a current I. It is placed in a magnetic field given by B=Bxi+Byj. Find the torque acting on the coil. A) -Ir2Byj B) Ir2(-Byi+Bxj) C) Ir2Byk D) Ir2Byj E) Ir2Bxk F  igure shows the cross section of a conductor carrying a current perpendicular to the page. The magnetic field is in the +x direction. The charge carriers are protons, and they move out of the page. Which pair of the four terminals (a, b, c, d) should be used to measure the Hall voltage and which terminal of the pair is at the higher potential? A) ac; a B) bd; d C) ac; c D)bd; b E) cd; c What is the value of q/m (in C/kg) for a particle that moves in a circle of radius 8 mm in a 5x10-3 T uniform magnetic field, if a perpendicular 600 N/C uniform electric field will make the path straight?  A) 1x106 B) 3x109 C) 4x106 D) 5x109 E) 2x109 A circular loop of wire whose radius is 10 cm carries a current of 2 A. It is placed in an uniform magnetic field of 10 T as shown in the figure. What is the potential energy of the magnetic dipole (in J)? A) 1.2 B) -1.2 C) -0.6 D) 0.6 E) 0 A  wire of 1 m length and 50 g mass is suspended as shown in figure, by a pair of flexible leads in a magnetic field of 0.5 T. What is the magnitude (in A) and direction of the current required removing the tension in the supporting leads? A) 2/5 B) 2/5 C) 1 D) 1 E) 1/4 
A circular loop of wire 30 mm in radius carries a current of 20 A is placed perpendicularly in a magnetic field of 1 T as shown in figure. The current initially flows in clockwise (figure a). As it turns to loop becomes the current flows counterclockwise (figure b) the work (in mJ) done by the external agent is : A) 27 B) 18 C) 54 D) 108 E) 0 A long wire carrying a current of 15 A is placed perpendicularly in a uniform external magnetic field of 6 mT. What is the distance (in mm) between the axis of wire and the points at which the resultant magnetic field is zero? A) 5 B) 1.2 C) 2.0 D) 4.5 E) 0.5 The current i , within a wire whose cross section has radius R is known to be distributed uniformly over that cross section. Which one of the figures shows the magnetic field as a function of the distance r from the wire’s axis within the wire and outside the wire? A A 200-turn solenoid having a length of 25 cm and a diameter of 1 cm carries a current of 25 A. What is the magnitude of the magnetic field (in mT) in the solenoid? A) 12 B) 24 C) 6 D) 0.12 E) 0.03 
A straight conductor carrying a current 2i is split into two identical semicircular turns as shown in the figure. The magnetic field at the center C of the circular loop is: A) 0i/2R B) 02i/R C) zero D) 02i/R2 E) 0i/4R2 An electron and a proton with velocities v=25x105i (in m/s) moves through the magnetic field, B=2j (in T). Find the force on the electron and on the proton, respectively (in N). A) –8x10-13k ; 8x10-13k B) –9x10-13j ; 1,7x10-13 j C) 1.2x106i ; –2.4x106i D) 8x10-13k ; –8x10-13k E) 9x10-13j ; –1,7x10-13 j What is the power supplied (in Watt) by a battery of =4 V connected to a resistance of R=2? A) 8 B) 6 C) 4 D) 16 E) 32 
Find the potential difference (Va-Vb) between the points a and b of the circuit given in figure? A) 6 B) 4 C) 3 D) 5 E) 7 A capacitor of capacitance C=5 F is discharged on a resistance R=4 k. Find the half-time and time constant (in ms) of the circuit, respectively? A) 14; 14 B) 20; 14 C) 20; 20 D) 8; 6 E) 14; 20 
Find the equivalent resistance between the points a and b for the given circuit? A) 3R/4 B) 4R/3 C) 4R D) 2R/3 E)3R/2 Which of the following sentences are correct for voltmeter and ammeter? I- Voltmeter is connected in parallel, ammeter is connected in series to the circuits. II- Voltmeter is connected in series, ammeter is connected in parallel. III- The internal resistance of a voltmeter must be very high. IV- The internal resistance of an ammeter must be very small. V- The internal resistances of an ammeter and a voltmeter are not important. A Find the current in the circuit? A) 0.6 B) 0.5 C) 0.4 D) 0.3 E) 0.2 
The capacitor with capacitance C=5 F is charged by closing switch S in the circuit shown. A long time after closing the switch S, find the maximum charge (in C) accumulated on the capacitor? A) 20 B) 50 C) 5 D) 25 E) 1 
Find the potential at point a for the given circuit? A) 3 B) -2 C) 2 D) -4.5 E) 4.5 
Find the current flowing through 3 resistance? A) 1 B) 2 C) 0 D) 3 E) 0.5 
What is the power dissipated (in Watt) on 4 resistance for the given circuit? A) 3 B) 2 C) 1 D) 4 E) 5 A  n electron with velocity v is entered in a region of magnetic and electric fields which are perpendicular. What is the relation between the magnitudes of magnetic and electric fields in order not to change the electron orbit?
A) B=ev B) B=E/ev C) B=E/v D) B=vE E) B=evE A particle of mass m=1 g and charge q=30 C is entered perpendicularly to a magnetic field region of B=3 T with velocity v=9x106 m/s. Find the radius (in m) of circular motion of the particle in the magnetic field? A Magnetic field in a circular region of radius R=5 cm is directed into the page and changes as B=5cos(4t) shown in the figure. Find the induced electric field (in V/m) just on the outer surface of the magnetic field region at t=7.5 s? A) 0.35 B) 0.25 C) 0.15 D) 0.50 E) 1 The current passing through a solenoid of r = 20 cm radius and having the turns of 105 turns/m in unit length is given by I=5cos(4t). What is the maximum induced electric field intensity outside of the solenoid (in V/m)? A) 3.5 B) -0.65 C) -1.2 D) 0.30 E) 0.24 A solenoid of inductance L=16 H has a resistance R=1. It is connected to a battery and stored with an amount of energy U=105 J. What is the dissipated energy (in kW) on the solenoid? A) 12.5 B) 25 C) 15 D) 7.5 E) 5 A solenoid with n=2000 turns/m carries a current i=5 A. Find the energy density (in J/m3) in the solenoid? A) 30 B) 120 C) 60 D) 150 E) 200 
The magnetic field variation as a function of time is given below for a single loop of radius 10 cm and resistance 10. What is the induced emf (in terms of V) in the circuit ? A) -1 B) 0 C) 1 D) 2.75 E) 9 
Two circular cross sectional poles of a magnet are 60 cm in diameter and the separation and the magnetic field between them are 20 cm and 0.1 T, respectively. What is the stored energy (in J) in the field? A) 300 B) 565 C) 225 D) 212 E) 324 Formula Sheet  Download 172 Kb. Do'stlaringiz bilan baham: 
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) B) C) D) E) 
) I B) I-V C) I-III-IV D) III-IV-V E) II-III
) 1000 B) 10 C) 600 D) 300 E) 100