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Question 19N.3.SL.TZ0.3b(ii)

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.SL.TZ0.3b(ii)
Level SL Paper 3 Time zone TZ0
Command term Deduce Question number b(ii) Adapted from N/A
b(ii).
[Maximum mark: 2]
19N.3.SL.TZ0.3b(ii)

A long straight current-carrying wire is at rest in a laboratory. A negatively-charged particle P outside the wire moves parallel to the current with constant velocity v relative to the laboratory.

In the reference frame of the laboratory the particle P experiences a repulsive force away from the wire.

(b(ii))

Deduce, using your answer to part (a), the nature of the force that acts on the particle P in the rest frame of P.

[2]

Markscheme

«from 3a»
force must still be repulsive ✔

for P there is no magnetic force AND force is electric/electrostatic
OR
since P is at rest the force is electric/electrostatic ✔

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