Exam 20: Induced Voltages and Inductance

A plane with a wingspan of 35.0 m is flying horizontally at a speed of 280 m/s over a location where the Earth's magnetic field is 45.0 μT at 55° below the horizontal.What voltage is generated between the wingtips?

Two loops of wire are arranged so that a changing current in one,the primary,will induce a current in the other,the secondary.The secondary loop has twice as many turns as the primary loop.The current in the primary at this moment is 3 A and increasing.The current in the secondary must be

A 460-turn solenoid of length 30.0 cm and radius 4.00 cm carries a current of 3.50 A. What is the magnetic field strength inside the coil at its midpoint? -​What is the magnetic field strength inside the coil at its midpoint?

The magnetic field inside a circular loop of wire of radius 30 cm increases at a constant rate from 2.0 × 10^-3 T to 3.5 × 10^-3 T in 0.47 s.If the resistance of the loop is 0.31 Ω,what is the current in the loop?

A square coil,enclosing an area with sides 2.75 cm long,is wrapped with 1 875 turns of wire.A uniform magnetic field perpendicular to its plane is turned on and increases to 0.390 T during an interval of 1.70 s.What average voltage is induced in the coil?

A circuit consists of a 9.3-mH coil,a 16.0-V battery,a parallel combination of a 19-Ω resistor and a 6.0-Ω resistor,and a switch,all in series.What is the time constant of this circuit?

A 14.0-V battery is connected in series with a switch,5.0-Ω resistor and coil.What energy is stored in the coil when the current is 2.8 A? The time constant is 4.8 × 10−⁴ s.

A metal rod is falling toward the surface of the Earth near the equator.As it falls,one end of the rod becomes positively charged due to the motional emf of the rod through the Earth's magnetic field.The rod is oriented so that

A circular loop of wire has its radius reduced in half in time Δt.A uniform magnetic field is at an angle of 60° to the plane of the coil,and the magnetic field doubles its intensity in the same time interval Δt.During this interval,what happens to the flux through the coil?

By what factor does the maximum energy stored in a series RL circuit change if the resistance is doubled and the inductance is tripled in the circuit?

A 460-turn solenoid of length 30.0 cm and radius 4.00 cm carries a current of 3.50 A. What is the magnetic field strength inside the coil at its midpoint? -The units T·m²/s are equivalent to:

In a circuit made up of inductor L,resistance R,ammeter,battery and switch in series,the current is greatest at which of the following times,as measured after the switch is closed?

A straight wire of length Is oriented east-west and is in a magnetic field B pointing north.The wire is moving downward at a constant speed v.Which end of the rod is positively charged?

One time constant after an RL circuit has its switch closed,how does the current I in it compare to the maximum current I_max that occurs for this circuit?

An RL series circuit has the following components: 9.2-mH coil,1.2-Ω resistor,16-V battery,ammeter and switch.What is the time constant of this circuit?

A bar magnet is held stationary while a circular loop of wire is moved toward the magnet at constant velocity at position A as in the figure. The loop passes over the magnet's center at position B and moves away from the magnet at position C.Viewing the loop from the left as indicated in the figure,for which position is the induced current zero?

A large jetliner with a wingspan of 51.0 m flies horizontally and due north at a speed of 440 m/s in a region where the magnetic field of the earth is 48.4 µT directed 30.0° below the horizontal.What is the magnitude of the induced emf between the ends of the wing?

The function of the electric motor is which one of the following conversion processes?

The magnet moving past an object will produce eddy currents in the object if the object:

An emf of 0.52 V is induced in a 0.71-H inductor.What is the rate of change of current through the inductor?