According to the Right-Hand Thumb Rule,what does the thumb indicate?

Define magnetic field. Describe an activity to draw magnetic field lines around a bar magnet from one pole to another pole.

By which instrument can the presence of a magnetic field be determined?

$A$ square coil moves in a plane with uniform velocity $v$ parallel to its sides. $A$ magnetic field $B$ points perpendicular and into the loop. What is the induced current in the coil?

The principle of which of these devices is based on electromagnetism?

The following diagram shows two straight wires carrying current. Copy the diagram and draw the pattern of lines of force around them and mark their directions.