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Measurements and Instrumentation - Engineering

Q1:

Which of the following quantities have same dimension in emu and esu?
  1. Current
  2. Electrical power
  3. Electrical energy
Select the answer as per following codes

A 1 only

B 1 and 2

C 2 and 3

D 1 and 3

ANS:C - 2 and 3

How can anyone explain it?