In the circuit in the diagram, the ammeter reads 7.0A. Determine the unknown emf $\epsilon$.

The top cell in the circuit in the diagram has emf 6.0V. The emf of the cell in the lower part of the circuit is 2.0V. Both cells have negligible internal resistance. AB is a uniform wire of length 1.0m and resistance $4.0\Omega$. When the variable resistor is set at $3.2\Omega$ The galvanometer shows zero current. Determine the length AC.

Describe the energy changes taking place in the circuit shown in the diagram.

Calculate the current in, and potential difference across, given resistor in the circuit shown in the diagram.

Calculate the current in, and potential difference across, the resistor in the circuit shown in the diagram.

Determine the direction of the missing quantity from B,v, and F in the given diagram. The circle represents a positive charge.

Determine the direction of the missing quantity from B,v, and F in the given diagram. The circle represents a positive charge.