Prokofiev VL - the solution of the entire version 09 on

Product description

Task 2.9

Two balls weighing 2 mg are suspended at a common point on filaments 0.5 m long. The balls were reported to charge and

Separate the filaments by 90 °. Determine the strength and potential of the field in the point of suspension of the ball.

Task 2.19

A charge of -1 nC was moved to the charge field +1.5 nC from a point with a potential of 100 V to a point with potential

600 V. Determine the work of the field forces and the distance between these points.

Task 2.29

The energy of a flat air condenser is 0.4 nJ, the potential difference on the plates is 600 V, the area

Plates 1 cm2. Determine the distance between the plates, the strength and the volume density of energy

Fields of the capacitor.

PROBLEM 2.39

To the current source, connect the resistor once with a resistance of 1 ohm, another time - 4 ohms. In both

The same amount of heat is allocated to the resistors at the same time. Identify

Internal resistance of the current source.

Task 2.49

The current flows through the square frame 4 A. The magnetic field strength in the center of the frame is 45 A / m. Identify

Perimeter of the frame.

PROBLEM 2.59

On rectilinear long parallel conductors, located at a distance of 2 cm, in one

1 A current flows. What work per unit length of conductors must be done to

Extend them to a distance of 4 cm?

Task 2.69

A single-layer solenoid without a core of 20 cm in length and 4 cm in diameter has a dense winding of copper

Wire diameter of 0.1 mm. For 0.1 s, the current in it decreases uniformly from 5 A to 0. Determine

Electromotive force induction in the solenoid.

Task 2.79

According to the winding of the solenoid with parameters: number of turns - 1000, length 0.5 m, diameter - 4 cm; Current flows 0.5A.

The dependence B = f (H) for the core is shown in Fig. 4. Determine the flux linkage, energy and

The volumetric energy density of the solenoid.