(a)
State what is meant by a magnetic field.
[ 2 ]
[Maximum number: 1]
A uniform magnetic field of flux density B makes an angle with a flat plane PQRS , as shown in Fig. 5.1.
Fig. 5.1
The plane PQRS has area A.
(a)
State
[ 1 ]
(i)
what is meant by a magnetic field,
[ 1 ]
(a)
State the type of field, or fields, that may cause a force to be exerted on a particle that is
[ 2 ]
(i)
uncharged and moving,
[ 1 ]
(ii)
charged and stationary,
[ 1 ]
(a)
Charged parallel plates, as shown in Fig. 7.1, produce a uniform electric field between the plates.
Fig. 7.1
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.
[ 2 ]
(i)
State and explain the direction of the magnetic field between the plates.
[ 2 ]
(a)
State what is meant by a magnetic field.
[ 2 ]
[Maximum number: 6]
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
(a)
the large uniform magnetic field,
[ 3 ]
(b)
the non-uniform magnetic field.
[ 3 ]
[Maximum number: 4]
A person is to be investigated using a magnetic resonance (MR) scanner.
(a)
This technique involves the use of two superimposed magnetic fields. Describe the functions of these two magnetic fields.
[ 4 ]
[Maximum number: 2]
During magnetic resonance imaging to obtain information about internal body structures, a large constant magnetic field is used with a calibrated non-uniform magnetic field superimposed on it.
(a)
State and explain the purpose of
[ 2 ]
(i)
the large constant magnetic field,
[ 2 ]