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Physics problems: magnetism

Part 7

 

Problem 61.

Two identical long wires of radius current are parallel and carry identical currents in opposite directions. Separation between the wires is flux. What is the inductance per unit length of the wires? Consider the flux only in the region between the wires.

Solution

 

Problem 62.

A conducting straight wire of length 20 cm is moving with a constant speed perpendicular to uniform 0.1 T magnetic field. The wire is perpendicular to the magnetic field. The voltage across the wire is 0.5 V. Find the speed of the wire.

Solution

 

Problem 63.

A conducting straight wire of length 20 cm is moving with a constant speed of 5 m/s perpendicular to uniform 0.2 T magnetic field. The wire is perpendicular to the magnetic field. Calculate the voltage across the wire.

Solution

 

Problem 64.

A flying airplane develops a 0.5 V potential difference between the tips of its wings. The vertical component of the magnetic field is  electricity. Calculate the speed of the airplane if the distance between the tips of the wings is 12 m.

Solution

 

Problem 65.

An airplane flies horizontally with a speed of 900 km/h. The distance between the tips of the wings of the airplane is 12 m. The vertical component of the magnetic field is  field. Calculate the potential difference between the tips of its wings.

Solution

 

 

 

Problem 66.

The current in a electric flux inductor depends on time as electric current. What is the voltage across the inductor at electric resistance?

Solution

 

Problem 67.

The current flowing through a electric force inductor depends on time as magnetic field. How much energy is stored in the inductor at energy? What is the voltage across the inductor at kinetic energy?

Solution

 

Problem 68.

An inductor with an inductance of electricity and a resistance of electric field is connected to a battery with time-dependent emf. The current through the inductor depends on time as magnetic field. Calculate the emf of the battery as a function of time?

Solution

 

Problem 69.

An inductor with an inductance of electric current is connected to a battery, the emf of which depends on time as  electric field.  Calculate the current through the inductor. Neglect the resistance of the circuit.

Solution

 

Problem 70.

The magnetic flux through a 100-turn coil is increased at a rate of 0.1 Wb/s. The inductance of the coil is current. If the coil’s resistance is 20 ohm and it is connected to an external circuit with the resistance of 40 ohm, find the current through the coil.

Solution

 

 

 

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