Beatrice aligned her galvanometer 90◦ off, so that its field was in line with (or against) Earth’s own field. As she increased current, the needle remained stationary until it suddenly changed direction at one amount of current. How did the needle behave at this particular current? What can Beatrice conclude about the strength of Bgalv at the instant when the needle moves? Draw a sketch of this setup.

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Beatrice aligned her galvanometer 90◦ off, so that its field was in line with (or against) Earth’s own field. As she
increased current, the needle remained stationary until it suddenly changed direction at one amount of current.
How did the needle behave at this particular current? What can Beatrice conclude about the strength of Bgalv
at the instant when the needle moves? Draw a sketch of this setup.

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