IB Physics SL D 3 6 Force Between Parallel Wires Topic Practice

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Question 1

[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 4.2Ω4.2 \Omega and a total length of 1.25 m .

Figure for 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∘C20^{\circ} \mathrm{C} to its operating temperature at 35∘C35^{\circ} \mathrm{C}.

Question (a)

(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 ]

Question (i)

(i)

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

[ 1 ]

Question (ii)

(ii)

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

[ 2 ]
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