# Prokofiev VL - the solution of the entire version 09 on

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# Description

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.

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.
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.

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?
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.