When using the right-hand rule to determine the direction of the magnetic field around a current-carrying wire, the of the right hand must point in the direction of the current.

The thumb of the right hand must point in the direction of the current.

Explanation:

The right hand rule is used to find the direction of magnetic field around a current-carrying wire. In this rule, it is consider to hold a current carrying wire in your right hand such that the thumb shows the direction of current. The curled finger gives the direction of magnetic field.

For example, if the current points in northward direction, then the direction of magnetic field is in anticlockwise direction.

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg