WorksheetsTopic 1 Magnetic Circuits
Total questions: 15
Worksheet time: 10mins
Which statement about Earth aligns with the material?
Earth is a large natural magnet
Earth has no magnetic field
Earth is only an artificial magnet
Earth repels all magnetic materials
In the diagrams, which statement best describes the direction of magnetic field lines outside a bar magnet?
They go from north pole to south pole
They go from south pole to north pole
They circulate randomly around the magnet
They start and end at the center region
Inside a magnet, what is the correct direction of magnetic lines of force?
From center to both poles equally
They have no defined direction
From north pole to south pole
From south pole to north pole
Which definition matches the description of a magnetic field given in the material?
Invisible lines of force leaving one pole and entering another
Visible arrows showing current through a conductor
A zone of static charges around insulators
A region where gravity outweighs electric forces
Consider a closed loop following a field line around the bar magnet. Where does it point inside the material?
Randomly alternating without preference
Toward the south pole through the body
Toward the north pole through the body
Perpendicular to the magnetization direction
Field lines from two like magnetic poles approach each other with the same direction of polarity. What is the resulting interaction?
They spiral forming helical paths
They repel and maintain separation
They attract and merge into one loop
They cancel producing a null region
Which behavior reflects the energy-minimizing tendency of magnetic lines of force?
They elongate to increase path length
They tend to shorten themselves
They stretch to avoid dense regions
They widen uniformly across space
In circuit diagrams, which symbol indicates current flowing away from the viewer through a straight conductor?
Arrow pointing toward the viewer
Cross symbol inside the circle
Circle with no marking
Dot symbol inside the circle
In the right illustration, the dot inside the circular end view indicates what about the current I?
Current alternates with no net direction
Current moves away from the viewer into the page
Current indicates magnetic flux only
Current approaches the viewer out of the page
Which rule determines the sense of magnetic field circulation around a straight current-carrying conductor?
Kirchhoff’s current law
Right-hand thumb rule
Fleming’s left-hand rule
Lenz’s law principle
When current flows toward the observer (dot symbol), what is the direction of magnetic field circulation?
Aligned with the wire
Radially inward to the wire
Clockwise around the wire
Counterclockwise around the wire
If the area perpendicular to flux doubles while flux is constant, how does B change?
B halves
B becomes zero
B doubles
B remains constant
The magnetomotive force (mmf) per unit length of the magnetic circuit is called
telsa
reluctance
magnetic flux density.
magnetic field strength.
The magnetomotive force (mmf) of a coil is 1000 A. If the current through the coil is decreased by half, its mmf will be
halved.
doubled.
quartered.
the same.
Magnetic flux in a magnetic circuit is produced by
reluctance.
automotive force.
electromotive force.
magnetomotive force.
