Question 5
5
Question 5(a)
5(a)
State what is meant by a magnetic field.
Answer
region (of space) where there is a force M1 either on / produced by magnetic pole or on / produced by current carrying conductor / moving charge A1
Question bank
A-Level CAIE Physics 20 1 Concept Of A Magnetic Field Question Bank
Practice A-Level CAIE Physics 20 1 Concept Of A Magnetic Field questions by syllabus topic with past-paper context, marks, difficulty and question previews on Eduninja.
Question 5
5
A uniform magnetic field of flux density B makes an angle \(\theta\) with a flat plane PQRS , as shown in Fig. 5.1. The plane PQRS has area A.
Question 5(a)
5(a)
State
Question 5(a)(i)
5(a)(i)
what is meant by a magnetic field,
Answer
region (of space) either where a moving charge (may) experience a force or around a magnet where another magnet experiences a force
Question 6
6
Question 6(a)
6(a)
State the type of field, or fields, that may cause a force to be exerted on a particle that is
Question 6(a)(i)
6(a)(i)
uncharged and moving,
Answer
gravitational B1
Question 6(a)(ii)
6(a)(ii)
charged and stationary,
Answer
gravitational and electric B1
Question 7
7
Question 7(b)
7(b)
Charged parallel plates, as shown in Fig. 7.1, produce a uniform electric field between the plates. The electric field outside the region between the plates is zero. A uniform magnetic field is applied in the region between the plates so that a beam of protons passes undeviated between the plates.
Question 7(b)(i)
7(b)(i)
State and explain the direction of the magnetic field between the plates.
Answer
force due to magnetic field must be upwards B1 B-field into the plane of the paper B1
Question 6
6
Question 6(a)
6(a)
State what is meant by a magnetic field.
Answer
region where a force acts on M1 a current-carrying conductor or a moving charge or a magnetic material / magnetic pole A1
Question 10
10
Magnetic resonance imaging (MRI) requires the use of a non-uniform magnetic field superimposed on a large uniform magnetic field. State and explain the purpose of
Question 10(a)
10(a)
the large uniform magnetic field,
Answer
nuclei spin/precess B1 spin / precess about direction of magnetic field B1 either frequency of precession depends on magnetic field strength or large field means frequency in radio frequency range B1 [3]
Question 10(b)
10(b)
the non-uniform magnetic field.
Answer
non-uniform field means frequency of precession different in different regions of subject enables location of precessing nuclei to be determined B1 enables thickness of slice to be varied/location of slice to be changed