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In the circuit shown in Fig. \( 3.45 \) the source have emf's \( \mathscr{E}_{1}=1.5 \mathrm{~V} \), \( \mathscr{E}_{2}=2.0 \mathrm{~V}, \mathscr{E}_{3}=2.5 \mathrm{~V} \), and the resistances are equal to \( R_{1}=10 \Omega \), \( R_{2}=20 \Omega, R_{3}=30 \Omega \). The internal resistanes of the sources are negligible. Find:
a potential difference \( \phi_{A}-\phi_{B} \) between the points \( A \) and \( B \).
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