State the rule to determine the direction of force experienced by a current - carrying straight conductor placed in a magnetic field which is perpendicular.

In the given figure of a prism which is the angle of emergence and angle of deviation.

The measuring instruments and the resistors are checked to be OK and then used in the electric circuit given. On closing the key the reading in the voltmeter and ammeter are $2V$ and $1 A$ respectively. Are the readings correct? If not what is the fault and what could be the possible reason for the fault?