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The diagram shows two poles of a magnet - OCR Gateway - GCSE Physics - Question 12 - 2019 - Paper 3
Question 12
The diagram shows two poles of a magnet. X is the position of a wire carrying a current perpendicularly into the paper. Which direction does the wire move? A B C ... show full transcript
Worked Solution & Example Answer:The diagram shows two poles of a magnet - OCR Gateway - GCSE Physics - Question 12 - 2019 - Paper 3
Step 1
Calculate the power dissipated by resistor K.
Answer
To calculate the power dissipated by resistor K, you can use the formula:
Where:
- P is the power in watts (W),
- I is the current in amperes (A),
- V is the voltage in volts (V).
Assuming the values are provided in a full question, choose the correct answer from the options provided.
Step 2
Which direction does the wire move?
Answer
Using the right-hand rule for motors, point your thumb in the direction of the current (into the paper) and your fingers in the direction of the magnetic field (from N to S). The force on the wire will be in the direction of your palm. Thus, the wire moves upwards, which corresponds to option D.