Physics
In the figure given below, when the key is pressed, a current passes in the wire in the direction from A to B (i.e., from south to north). The north pole of the compass needle will deflect towards:
- East
- North
- South
- West
Answer
West
Reason — When a current passes through a wire from south to north (A to B), it generates a magnetic field around the wire. According to the right-hand rule for electromagnetism, if you wrap your right-hand fingers around the wire in the direction of the current, your thumb will point in the direction of the magnetic field.
So, with the current flowing from A to B, if you curl your fingers around the wire, your thumb would point towards the west. This indicates that the magnetic field is directed towards the west.
Related Questions
The strength of a magnetic field depends on :
- magnitude of current
- direction of current
- both (1) and (2)
- none of the above
In the figure given below, current is passed in a downward direction through a cardboard. The magnetic field lines would be :
- straight lines
- concentric circles
- elliptical lines
- squares
According to the right hand thumb rule, the thumb points in the direction of …………… and fingers encircle the wire in direction of ……………
- magnetic field lines, current
- electric field lines, current
- current, magnetic field lines
- none of the above
In the figure given below, the direction of current in the loop is …………… . So, it behaves as a …………… .
- anticlockwise, south pole
- anticlockwise, north pole
- clockwise, north pole
- clockwise, south pole
