Problem 23.63 An engineer proposes to store 80 kJ of energy by flowing 1.2 kA of current through a superconducting solenoid that forms an inductor. • Part A What is the required inductance L? Express your answer to two significant figures and include appropriate units. 0.11 H Previous Answers v Correct Part B If the solenoid is to have a radius of 1.2 m and be wound with no more than 3 turns per meter, what length must the solenoid have? Express your answer to two significant figures and include appropriate units. ? 460 m Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining

The armature and field coils of a series-wound motor have a total resistance of 3.0 . When connected to a 120-V source and running at normal speed, the motor draws 4.0 A. (a) How large is tire back emf? (b) What current will the motor draw just after it is turned on? Can you suggest a way to avoid this large initial current?

Check Your Understanding A transformer steps the line voltage down from 110 to 9.0 V so that a current of 0.50 A can be delivered to a doorbell (a) What is the ratio of the number of turns in the primary and secondary windings? (b) What is the current in the primary winding? (c) What is the resistance seen by the 110-V source?

What is the self-inductance per meter of a coaxial cable whose inner radius is 0.50 mm and whose outer radius is 4.00 mm?

A transformer is used to down 110 V from a wall socket to 9.0 V for a ro. (a) If the primary winding has 500 turns, how many s does the secondary winding have? (b) If the radio operates at a current of 500 mA, what is the current 500 mA, what is the current through the primary winding?

At s1iat frequency is the reactance of a 20F capacitor equal to that of a 10-mH inductor?

Two coils close to each other have a mutual inductance of 32 mH. If the current in one coil decays according to I=I0eat , where I0= 5.0 A and =2.0103s1 , what is the emf induced in the second coil immediately after the current starts to decay? At t=10.0103s? ?

A small, rectangular single loop of wire with dimensions 1, and a is placed, as shown in the plan of a much larger, rectangular single loop of wire. The two short sides of the larger loop axe so far from the smaller loop that their magnetic fields over the smaller fields over the smaller loop can be ignored. What is the mutual inductance of the two loops?

Check Your Understanding (a) Calculate the self-inductance of a solenoid that is tightly wound with wire of diameter 0.10 cm, has a cross-sectional area of 0.90 cm2, and is 40 cm long. (b) If the current through the solenoid decreases uniformly from 10 to 0 A in 0.10 s, what is the emf induced between the ends of the solenoid?

In an oscillating RLC circuit, R=5.0 ,. L=5.0mH , and C = 500 F . What is the angular frequency of the oscillations?