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