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Edexcel | Physics WPH0 | S 15 4 1 | 1 hour 30 minutes

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16

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A beam of identical positive ions travels horizontally in a vacuum. The ions pass

between two charged plates and are deflected downwards by the electric field between

the plates.

The diagram shows the path of one of the ions.

16

(a)

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4 Mark s

Explain the path of the ion both between the plates and when it has left the plates.

(QWC – Work must be clear and organised in a logical manner using

technical wording where appropriate)

Between the plates there is a force

(references to repulsion and attraction are not sufficient)

Gives a downward acceleration

Or accelerates towards the negative plate

Constant horizontal velocity Or no forces act horizontally

Outside the plates no (electric) field /force acts

Or Outside the plates speed so large that gravitational effect negligible

16

(b)

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Whilst the electric field is still acting, the path of the ions can be returned to the

horizontal by applying a magnetic field over the same region as the electric field acts.

16

(b) (I)

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2 Mark s

Explain the conditions under which the ions have no overall deflection as they

pass between the plates.

Magnetic force = electric force Or Eq = Bqv

Forces must act in opposite directions Or resultant force is zero.

Or (magnetic) field into page

( do not credit if forces stated as being perpendicular to each other)

16

(b) (II)

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4 Mark s

potential difference across the plates is 60 V.

Calculate the magnetic flux density required so that there is no overall deflection

of the ions.

Magnetic flux density =

16

(c)

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3 Mark s

State and explain how the path of the ions in just the magnetic field would be

different from the path in just the electric field.

Upward path (not downwards) Or magnetic path is arc of a circle

Magnetic force changes direction as ions path changes

Or magnetic force perpendicular to path/velocity of ion.

Electric force constant direction

Or electric force always acts downwards.

Or electric path is parabolic

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