A moving-coil galvanometer has a rectangular coil 2.1 cm high and 1.2 cm wide, 250 turns, in a uniform radial field B=0.23 T. A spring provides restoring torque Kφ. A current of 100 μA gives deflection 28°.
Physics · Magnetic effect of current
A moving-coil galvanometer has a rectangular coil 2.1 cm high and 1.2 cm wide, 250 turns, in a uniform radial field B=0.23 T. A spring provides restoring torque Kφ. A current of 100 μA gives deflection
28°.
Sub-question 1
What is the torsional constant K of the spring?
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Sub-question 2
If K is reduced to half while current and B remain the same, the deflection becomes:
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Sub-question 3
If B=0.69 T and K=15.6×10⁻⁸ N·m/degree, the deflection is:
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