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The magnetic field produced by a long straight current carrying wire is 

The phase angle of a series  RL ac circuit with a 100-Ω resistor and a 20.0-mH inductor is 70.0°. What is the inductive reactance of this circuit?

The ampere is defined using the [BLANK-1] between current carrying wires

A 109  turn circular coil of radius  2.41  cm is immersed in a uniform magnetic field that is perpendicular to the plane of the coil. Over an interval of  0.159  s , the magnetic field strength increases from 58.3  mT to  98.3  mT . Find the magnitude of the average emf  induced in the coil during this time interval, in millivolts.

A simple ac circuit is composed of a capacitor connected across the terminals of an ac power source. If the frequency of the source is doubled, what happens to the reactance of the capacitor?

An ideal parallel-plate capacitor has a capacitance of  C. If the area of the plates is doubled and the distance between the plates is halved, what is the new capacitance?

A heart defibrillator being used on a patient has a resistance of [R] k  Ω and a capacitance of [C] μF.  If the initial voltage is 12.0 kV, how long does it take to decline to 600 V?

You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the  largest possible resistance, you should attach the leads to the opposite faces that measure

What charge accumulates on the plates of a 2.0-μF air-filled capacitor when it is charged until the potential difference across its plates is 100 V?

Three resistors with resistances of 2.0 Ω, 6.0 Ω, and 12 Ω are connected across an ideal dc voltage source  V as shown in the figure. If the total current through the circuit is  I = 2.0 A, what is the applied voltage  V?