बिंदु \( (0,0,-a) \) तथा \( (0,0, a) \) पर दो आवेश क्रमशः \( -q \) और \( +q \) स्थित हैं। \( x \...

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बिंदु \( (0,0,-a) \) तथा \( (0,0, a) \) पर दो आवेश क्रमशः \( -q \) और \( +q \) स्थित हैं। \( x \)-अक्ष पर बिंदु \( (5,0,0) \) से बिंदु \( (-7,0,0) \) तक एक परीक्षण आवेश को ले जाने में कितना कार्य करना होगा? यदि परीक्षण आवेश के उन्हीं बिंदुओं के बीच \( x \)-अक्ष से होकर न ले जाएँ तो क्या उत्तर बदल जाएगा?
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