32 1 Which arrangement of two coils has the larger mutual inductance Pink A B Yellow C They are equal 32 2 A large diameter two turn coil coil 2 is wrapped around a long smaller diameter solenoid coil 1 as shown Which is larger M12 or M21 M 12 1 I2 coil 2 coil 1 M 21 2 I1 A M12 B M21 C M12 M21 32 2b Now the number of turns in coil 2 is doubled What happens to M 2 I1 A M is half B M remains constant coil 2 C M doubles D M quadruples coil 1 E None of these Electric toothbrush CT 33 21 Inductor 1 consists of a single loop of wire Inductor 2 is identical to 1 except it has two loops on top of each other What is the B field at the center of coil 2 B2 compared to the field in the center of coil 1 A B2 B1 B B2 2 B1 C B2 4 B1 D B2 B1 2 I Coil 1 Coil 2 I CT 33 22 Inductor 1 consists of a single loop of wire Inductor 2 is identical to 1 except it has two loops on top of each other How do the self inductances of the two loops compare Recall L I N B A I A L2 2 L1 B L2 2L1 C L2 2L I Coil 1 Coil 2 I HL IN 1 What is the inductance of a solenoid with length d area A and turns length n A m0 n2 A B m0 n2 A d C m0 n2 d D m0 n A d E m0 n A uestion CT 32 4 Two long solenoids each of inductance L are connected together to form a single very long solenoid of inductance Ltotal What is Ltotal A 2L B 4L C 8L D none of these L L Ltotal CT 33 28 The switch is closed at t 0 What is the current through the resistor at t 0 R 20 A 0 A V 10V B 0 5 A C 1 A D 10 A E other L 10H CT 33 27 The switch is closed at t 0 What is the initial rate of change of current di dt in the inductor at t 0 Hint what is the V init across the inductor R 20 A 0 A V 10V B 0 5 A s C 1 A s D 10 A s E other L 10H CT 33 29 The switch is closed at t 0 What is the current through the resistor after a very long time R 20 A 0 A V 10V B 0 5 A C 1 A D 10 A E other L 10H HL IN 2 What are the units of L R A V B A C A s D S E 1 S HL IN 2 What is the voltage across an inductor as a function of time for a charging LR circuit t V A E L e R B C E L Ve t t D E L VL 1 e t E E L V 1 e E L VLe t CT 33 30 At time t 0 the switch is closed What is the current thru the inductor L just after the switch is closed t 0 R1 10 V 10V A 0 A B 0 5 A L 10H C 1 0 A R2 10 D other CT 33 31 At time t 0 the switch is closed What is the current thru the inductor L after a long time R1 10 V 10V A 0 A B 0 5 A L 10H C 1 0 A R2 10 D other CT 33 32 Now suppose the switch has been closed for a long time and is then opened Immediately after the switch is opened the current thru R2 is R1 10 V 10V A 0 A L 10H B Not 0 amps R2 10 CT 32 7 The same current i flows through solenoid 1 and solenoid 2 Solenoid 2 is twice as long and has twice as many turns as solenoid 1 and has twice the diameter Hint for a solenoid B mo n i What is the ratio of the magnetic energy contained in solenoid 2 to that in solenoid 1 that is what is E 2 E1 A 2 B 4 C 8 D 16 E None of these I 1 2 I HL AC 1 What is the average power dissipated by the resistor A zero B positive C negative D Not enough information CT 33 34 A light bulb is attached to a wall plug 120 VAC 60 Hz How many times a second is the instantaneous power output to the bulb equal to zero A Never there is always power B 30 times sec C 60 times sec D 120 times sec E Other 19 CT 33 35 A 100 W light bulb is attached to a wall plug 120 VAC 60 Hz What is the peak power output to the bulb A 100 W B Sqrt 2 100 W 141 W C 200 W D Other 20 CT 33 15 A transformer is attached to a battery and a resistor as shown The voltage difference across the resistor R is V N2 N1 R iron core A V D 0 B V N1 N2 E Other C V N2 N1 CT 33 17 A step down transformer is attached to an AC voltage source and a resistor How does IR compare to the current that is drawn from the AC source I in Iin I input A IR I input B IR I input IIRR C IR I input
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