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A teacher used the equipment shown in the figure below to demonstrate the motor effect. The copper rod in the figure above has a length of 7 cm and a mass of 4×10−4 kg. When there is a current of 1.12 A the resultant force on the copper rod is 0 N. Calculate the magnetic flux density. Gravitational field strength = 9.8 N/kg [5 marks]

A teacher used the equipment shown in the figure below to demonstrate the motor effect. The copper rod in the figure above has a length of 7 cm and a mass of 4×10−4 kg. When there is a current of 1.12 A the resultant force on the copper rod is 0 N. Calculate the magnetic flux density. Gravitational field strength = 9.8 N/kg [5 marks]

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A teacher used the equipment shown in the figure below to demonstrate the motor effect.
The copper rod in the figure above has a length of 7 cm and a mass of 4 × 10 − 4 kg .
When there is a current of 1.12 A the resultant force on the copper rod is 0 N .
Calculate the magnetic flux density. Gravitational field strength = 9.8 N / kg [5 marks]

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