If V, w, q stand for voltage, energy and charge, then V

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If V, w, q stand for voltage, energy and charge, then V can be expressed as—

1. V = dq
  dw
2. V = dw
  dq
3. dV = dw
  dq
4. dV = dq
  dw

Correct Option: B

Since voltage is, broadly saying work per unit charge, we can express V as w/q, or V as dw/dq.