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ABC एक समबाहु त्रिभुज है जिसकी प्रत्येक भुजा की लम्बाई 5 सेमी है। A पर `+100` स्थैत कूलॉम तथा B पर `-50` स्थैत कूलॉम का आवेश स्थित है। बिंदु C पर विद्युत क्षेत्र की तीव्रता तथा दिशा ज्ञात कीजिए ।
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`E^(2)=E_(1)^(2)+E_(2)^(2)+2E_(1)E_(2) cos 120^(@)`
`E_(1)=(100)/(5^(2)) " और "E_(2)=(50)/(5^(2))`
`therefore " "tan theta=(E_(1) sin 120^(@))/(E_(2)+E_(1)cos 120^(@))`
`cos 120^(@)=(1)/(2), sin 120^(@)=(sqrt3)/(2)`
5.291 डाइन प्रति स्थैत कूलॉम BC के लंबवत

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