Showing 21 to 30 of 479 Questions

An inductor that has an inductance of 15.0 H and a resistance of 30.0 Ω is connected across a 100V battery. What is the rate of increase of the current? (a) At t = 0 and (b) At t = 1.50 s?
0187 
When the switch in Figure P32.17 is closed, the current takes 3.00 ms to reach 98.0% of its final value. If R 10.0Ω, what is the inductance?
1243 
The switch in Figure P32.23 is open for t < 0 and then closed at time t = 0. Find the current in the inductor and the current in the switch as functions of time thereafter.
1340 
A series RL circuit with L = 3.00 H and a series RC circuit with C = 3.00 'F have equal time constants. If the two circuits contain the same resistance R, (a) What is the value of R and (b) What is the time constant?
1530 
A current pulse is fed to the partial circuit shown in Figure P32.25. The current begins at zero, then becomes 10.0 A between t = 0 and t = 200 μs, and then is zero once again. Determine the current in the inductor as a function of time.
2338 
One application of an RL circuit is the generation of time varying high voltage from a lowvoltage source, as shown in Figure P32.26. (a) What is the current in the circuit a long time after the switch has been in position a? (b) Now the switch is thrown quickly from a to b. Compute the initial voltage across each resistor and across th
21126 
A 140mH inductor and a 4.90Ω resistor are connected with a switch to a 6.00V battery as shown in Figure P32.27. (a) If the switch is thrown to the left (connecting the battery), how much time elapses before the current reaches 220 mA? (b) What is the current in the inductor 10.0 s after the switch is closed? (c) Now the switc
1979 
Consider two ideal inductors L1 and L2 that have zero internal resistance and are far apart, so that their magnetic fields do not influence each other. (a) Assuming these inductors are connected in series, show that they are equivalent to a single ideal inductor having Leq= L1 + L2. (b) Assuming these same two inductors are connected
0206 
Calculate the energy associated with the magnetic field of a 200turn solenoid in which a current of 1.75 A produces a flux of 3.70 x 104 Wb in each turn.
0149 
The magnetic field inside a superconducting solenoid is 4.50 T. The solenoid has an inner diameter of 6.20 cm and a length of 26.0 cm. Determine (a) The magnetic energy density in the field and (b) The energy stored in the magnetic field within the solenoid.
1344