CIE iGCSE Co-Ordinated Science P4.5.3 Magnetic effect of current Exam Style Questions Paper 1
Question
The diagrams each show a wire carrying a current in the direction of the arrow. Which diagram shows the pattern and the direction of the magnetic field around the wire?
▶️Answer/Explanation
Answer: C
Explanation: The magnetic field around a current-carrying wire forms concentric circles, and the direction of the field can be determined using the right-hand rule. Diagram C correctly shows this pattern and direction.
Question
The diagrams show the cross-section of a straight wire carrying a current into the page.
Which diagram shows the pattern and direction of the magnetic field around the wire?
A. concentric circles clockwise
B. concentric circles anticlockwise
C. straight lines parallel to the wire
D. straight lines perpendicular to the wire
▶️Answer/Explanation
Answer: B. concentric circles anticlockwise
Explanation: The magnetic field around a current-carrying wire forms concentric circles. Using the right-hand grip rule, if the current is into the page, the magnetic field direction is anticlockwise.
Question
A straight vertical wire passes through the centre of a card. The wire carries a current in the direction shown.
The current produces a magnetic field around the wire. Which diagram shows the pattern of the magnetic field lines and their direction when seen from above?
▶️Answer/Explanation
Answer: A
Explanation: The magnetic field lines around a straight current-carrying wire form concentric circles, and the direction of the field can be determined using the right-hand grip rule. Diagram A correctly shows the circular field lines and their direction.
Question
Which type of magnet can be switched on and off many times per second?
(A) an electromagnet only
(B) a permanent magnet only
(C) both electromagnets and permanent magnets
(D) neither electromagnets or permanent magnets
▶️Answer/Explanation
Ans : A
Question
There is a current-carrying wire perpendicular to the page.
The direction of the current is into the page.
Which diagram shows the pattern and direction of the magnetic field around the wire? 
▶️Answer/Explanation
Ans : A
Question
Which material is used for the core of an electromagnet?
A aluminium
B copper
C iron
D steel
▶️Answer/Explanation
Ans : C
Question
A straight wire carries a current into the page.
Which diagram shows the pattern and direction of the magnetic field around the wire due to the
current?
▶️Answer/Explanation
Ans : A
Question
The diagrams show a wire carrying a current out of the page.
Which diagram shows the pattern of magnetic field lines near the wire?
▶️Answer/Explanation
Ans: D
Question
The diagrams show the cross-section of a straight wire carrying a current into the page.
Which diagram shows the pattern and direction of the magnetic field around the wire?
▶Answer/Explanation
Ans : C
Question
Which diagram shows the pattern and the direction of the magnetic field around a straight wire that is carrying a current into the page?
▶️Answer/Explanation
Ans: C
Question
Which diagram shows the pattern of the magnetic field due to a current in a straight wire?
▶️Answer/Explanation
Answer: A
Explanation: The magnetic field around a straight current-carrying wire forms concentric circles around the wire. Diagram A correctly represents this pattern. Therefore, the correct answer is A.
Question
A solenoid carrying a current produces a magnetic field. Which diagram shows the magnetic field pattern?
▶️Answer/Explanation
Answer: D) Diagram D
Explanation: A solenoid carrying a current produces a magnetic field with field lines running parallel to the axis of the solenoid, as shown in Diagram D.
Question
A current-carrying wire passes through a flat card. The arrow on each wire shows the direction of the current.
Which diagram shows the pattern of the magnetic field on the card and the direction of the magnetic field lines?
▶️Answer/Explanation
Answer: D
Explanation: The magnetic field around a current-carrying wire forms concentric circles, and the direction of the field lines can be determined using the right-hand rule. In the correct diagram, the field lines should be concentric circles around the wire, and the direction should follow the right-hand rule. Therefore, the correct answer is D.