#1 Southern University and A&M; College, PHYS 222-02 Test 2 (Spring 2018) Instru
ID: 779030 • Letter: #
Question
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Southern University and A&M; College, PHYS 222-02 Test 2 (Spring 2018) Instructor: Dr. Feng Gao Name: Student ID:- 1. (a) What is the equivalent capacitance Ceq of combination of n individual capacitance connected in series and in parallel? (b) What is the equivalent resistance Rv of combination of n individual resistors connected in series and in parallel? (10 points) 2. (a) Find the equivalent capacitance for the combination of capacitances shown in Figure 1, across which the potential difference V is applied. Assume C, = 10 lf. C2 = 5C-51F (b) If the potential difference applied to the input terminals is V- 12.5 V, what is the charge on Ci? (25 points) Figure Ci Cy 6 . 3. The emfs and resistances in the circuit of Figure 2 have the following values: E,-4 V, E,-2 V, r,-1 , r,-2.5 , R (a). What is the current in the circuit? (b). What is the potential difference between the terminals of battery 1? (20 points) Figure 2. 2. ,- 10 2, R- 202, 4. Figure 3 shows a multiloop circuit containing one ideal battery and four resistances with the following values: R (a) What is the current through the battery? (b) What is the current iz through R? (25 points) Figure 3, b th a kinetic energy of 6.0 MeV enters a uniform magnetic field with magnitude of 1.5 mT. If the velocity of the proton 5. A proton wi is perpendicular to the direction of the magnetic field, what magnetic deflecting force acts on the proton as it enters the magnetic field? (The proton mass is 1.67*1027kg) (20 points)Explanation / Answer
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(a) Equivalent capacitance of n capacitors connected in series
1/Ceqv=1/C1+1/C2+1/C3+1/C4+.........+1/Cn
Equivalent capacitance of n capacitors connected parallel
Ceqv=C1+C2+C2+C4+....................+Cn
(b) Equivalent resistance of n resistances connected in series
Reqv=R1+R2+R3+R4+............+Rn
Equivalent resistance of n resistances connected in parallel
1/Reqv=1/R1+1/R2+1/R3+1/R4+...........+1/Rn
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