IB Physics SL D.3.6 Force between parallel wires Question Bank

Practise IB Physics SL/HL D.3.6 by applying force between parallel wires concepts to exam-style physics questions.

[Maximum number: 3]

An electrically heated pad is designed to keep a pet warm.

The pad is heated using a resistor that is placed inside the pad. The dimensions of the resistor are shown on the diagram. The resistor has a resistance of $4.2 \Omega$ and a total length of 1.25 m .

Figure for Question D.3.6—Force between parallel wires question 1 — IB Physics SL

When there is a current in the resistor, the temperature in the pad changes from a room temperature of $20^{\circ} \mathrm{C}$ to its operating temperature at $35^{\circ} \mathrm{C}$ .

(a)

When there is a current in the resistor, magnetic forces act between the resistor strips.

For the part of the resistor labelled RS,

[ 3 ]

(i)

outline the magnetic force acting on it due to the current in PQ .

[ 1 ]

(ii)

state and explain the net magnetic force acting on it due to the currents in PQ and TU .

[ 2 ]

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D.3.6—Force between parallel wires question 1

Question (a)

Question (i)

Question (ii)