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भारतीय रसायन के पिता आचार्य प्रफुल्ल चंद्र रे की जयंती पर व्याख्यान का आयोजन

भारतीय रसायन के पिता आचार्य प्रफुल्ल चंद्र रे की जयंती पर व्याख्यान का आयोजन विज्ञान भारती उदयपुर इकाई एवं बीएन कॉलेज ऑफ फार्मेसी, बीएन विश्वविद्यालय के संयुक्त तत्वावधान में कार्यक्रम सम्पन्न उदयपुर, 2 अगस्त। भारतीय रसायन के पिता आचार्य प्रफुल्ल चंद्र रे की जयंती के अवसर पर विज्ञान भारती उदयपुर इकाई (चित्तौड़ प्रांत) एवं बीएन कॉलेज ऑफ फार्मेसी, बीएन विश्वविद्यालय के संयुक्त तत्वावधान में एक विशेष व्याख्यान का आयोजन किया गया। कार्यक्रम का उद्देश्य आचार्य पी.सी. रे के वैज्ञानिक योगदान एवं उनके देशभक्ति से ओतप्रोत जीवन पर प्रकाश डालना था। ज्ञातव्य है कि भारत की पहली फार्मा कंपनी आचार्य रे ने ही बंगाल केमिकल एंड फार्मास्यूटिकल्स लिमिटेड, कोलकाता में 1901 में प्रारंभ की थी। कार्यक्रम में विज्ञान भारती के उद्देश्य एवं गतिविधियों की जानकारी डॉ. अमित गुप्ता द्वारा दी गई। आचार्य पी.सी. रे के जीवन और कार्यों पर मुख्य व्याख्यान डॉ. लोकेश अग्रवाल द्वारा प्रस्तुत किया गया। उन्होंने बताया कि कैसे आचार्य रे ने विज्ञान को समाज की सेवा का माध्यम बनाया और रसायन विज्ञान में भारत को आत्मनिर्भर बनान...
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Coulomb’s law | Electromagnetics

Coulomb’s law

  • According to Coulomb's law the force between two charges
  • is directly proportional to the product of two charges.
  • is inversely proportional to the square of the distance between the charges.

  • F ∝ q1 q2
  • F ∝ 1 / r2
  • By using above two equation we get, F ∝ q1 q2 / r2
  • F = k q1 q2 / r2
  • Here k is a constant and its value depends on the medium in which charge is placed and the system of unit used.
  • For vacuum k = 1/4πε0 = 9 х 109 Nm2 / C2.
  • ε0 is permittivity of free space and its value is 8.854 х 10-12 C2 / Nm2.
  • In vacuum       Fvac = q1 q2 / 4πε0 r2
  • In medium      Fmed = q1 q2 / 4πε r2
  • ∴           Fvac / Fmed = ε / ε0= εr= K
  • Here εr is relative permittivity or dielectric constant.

Important points

  • Coulomb’s law is valid only for static and point charge.
  • Coulomb’s law satisfies the Newton’s third law of motion.
  • Coulomb’s law in electrostatic has the same position, which the laws of motion has in gravitation.


    To know about this lecture in more detail please visit on     https://youtu.be/yrSiS_2F8So
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