At last, around four in the afternoon, the poet (or the editor) arrived. He was a tall man, very English, very serious and of course very unknown to all of us. Battling with half a dozen pedestal fans on the shooting stage, The Boss read out a long speech. It was obvious that he too knew precious little about the poet (or the editor). The speech was all in the most general terms but here and there it was peppered with words like 'freedom' and 'democracy'. Then the poet spoke. He couldn't have addressed a more dazed and silent audience — no one knew what he was talking about and his accent defeated any attempt to understand what he was saying.
(Poets and Pancakes)
A battery of emf \( E \) and internal resistance \( r \) is connected to a rheostat. When a current of 2A is drawn from the battery, the potential difference across the rheostat is 5V. The potential difference becomes 4V when a current of 4A is drawn from the battery. Calculate the value of \( E \) and \( r \).
If \(\begin{vmatrix} 2x & 3 \\ x & -8 \\ \end{vmatrix} = 0\), then the value of \(x\) is: