Which of the following expression is correct for electric field strength?
वि द्यु त क्षेत्र ती व्रता के लि ए नि म्नलि खि त में से कौ न सा व्यंजक सही है?
A- E = Dε
B- E = r/ε
C- E = πD
D- E = D/ε
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