A bar magnet is pushed through a coil of wire of cross-sectional area 0.020 m 2 as shown in the figure. The coil has seven turns, and the rate of change of the strength of the magnetic field in it due to the motion of the bar magnet is 0.040 T/s. What is the magnitude of the induced emf in that coil of wire?

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?

In a  RLC circuit, the values of the inductance and capacitance are both halved. As a result of this change, the resonance frequency of the circuit is

An iron ring lies in a magnetic field as shown in the diagram. The field is uniformly increasing in magnitude. The induced current in the ring isScreen Shot 2021-07-29 at 3.16.27 PM.png 

How much current must pass through a 400-turn ideal solenoid that is 4.0 cm long to generate a 1.0-T magnetic field at the center? ( μ 0 = 4π × 10 -7 T ∙ m/A)

The earth’s northern magnetic pole acts like

Which of the following statements is true for a series  RLC ac circuit in resonance? (There could be more than one correct choice).

A 1.0-mm diameter extension cord is made of metal having a resistivity of 1.68 × 10 -8 Ω ∙ m. When it carries a current of 15 A, what is the potential difference between two points in the cord that are 50 m apart?

A 4.0-g bead carries a charge of 20 μC. The bead is accelerated from rest through a potential difference  V, and afterward the bead is moving at 2.0 m/s. What is the magnitude of the potential difference  V?

If the result of your calculation of a quantity has SI units kg ∙ m 2/(s 2 ∙ C), that quantity could be