How many degrees should a student expect their Tangent Galvanometer compass to d

Question

How many degrees should a student expect their Tangent Galvanometer compass to deflect when the current through the Helmholtz coils has doubled from what it was when the compass deflection was 15 degrees? How many degrees should a student expect their Tangent Galvanometer compass to deflect when the current through the Helmholtz coils has doubled from what it was when the compass deflection was 15 degrees? How many degrees should a student expect their Tangent Galvanometer compass to deflect when the current through the Helmholtz coils has doubled from what it was when the compass deflection was 15 degrees?

Explanation / Answer

eqn for current in MCG is i = C theta /BAn

so current i is directly proportional to angle theta

so if current doubles, theta also doubles

so new angle is 30 deg

new angle is 30 deg, but deflection is 15 more deg

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