________________
S. The spheres Q, and Q, which can be adjusted along the rods M and N are slided so that the circuit of the gap S is in resonancw with R. The electromagnetic waves generated at S are then detected as sparks occuring across the gap R.
When a spark passes across S, a stream of electrons pass across the spark gap from the negatively charged sphere to the positively charged sphere, reversing their polarities. In this situation the direction of the electric field at C and D will be reversed. Thus, at each passage of spark the polarity of charges on Q, and Q2 reverses and the electric field dirction in the surrounding region also reverses; i.e. the electric field oscillates.
Further, the stream of electrons crossing the spark gap constitutes a current. This alternating current in the spark gap generates an alternating magnetic filed in the neighbourhood. Application of Ampere's right hand rule readily shows that the resulting magnetic field is perpendicular to the electric field.
According to Maxwell's electromagnetic field theory, these electric and magnetic fields in the neighbourhood do not appear instantaneously. The influence of the oscillations of S spread to the neighbouring region with velocity of light. Thus, at various points in the region around S, the oscillations have phases which depend upon their distance from S.
જુઓ, ભાગ પહેલો, ટિપ્પણ ૫૪,૫૫
9. (c)
૮. જુઓ, ભાગ પહેલો, ટિપ્પણ ૬૧
9. http://www.edmtt.com/articles reports/edmprocesses.html. by Dean Brink, President and Technical Director, EDM Technolgoy Transfer. EDM: Principles of operation, Part I, Different types of machining processes that use EDM. Pages 1, 2, 3
10. G.E.C. Type K Oil Circuit Breakers, by The General Electric Company of India Ltd.
Circuit Breaker
Type K range of oil circuit breakers have been designed for use on systems upto 660 volts and for normal current ratings upto 1200 A. The circuit breakers are of fabricated sheet steel construction and specially designed for installations in situation where reliability and robust construction are essential.
All circuit breakers are subjected to a series of routine mechanical and electrical tests to ensure proper and reliable working in service.
Jain Educationa International
236
For Personal and Private Use Only
www.jainelibrary.org
