Circuits Questions

The current $I$ drawn from the $5\text{V}$ source in the following circuit is:

The circuit has two oppositely connected ideal diodes in parallel. What is the current flowing in the circuit?

A rectangular loop has a sliding connector $\text{PQ}$ of length $l$ and resistance $R\Omega$ and it is moving with a speed $v$ as shown. The set-up is placed in a uniform magnetic field $B$ going into the plane of the paper. The three currents $I_1,I_2$ and $I$ (where $I$ is through the connector) are: