Coil of a galvanometer is suspended in a radial magnetic field so that the deflecting torque on the coil is always___________________?
Correct answer: D. BINA
- A. BINA cosa
- B. BINA sina
- C. BINA tana
- D. BINA
Explanation
The deflecting torque on a current-carrying coil is τ = BINA sin α. In a radial magnetic field, the field is always effectively perpendicular to the coil, so sin α = 1 and the torque remains BINA. The likely mistake is choosing b, which leaves the general sine factor in place instead of using the radial-field condition.
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About Magnetic Flux Density
Magnetic flux density measures the magnetic force acting on a current carrying conductor or moving charge in a magnetic field. Work includes the relations B equals F divided by IL and F equals qvB, the tesla as its SI unit, field direction and the distinction between flux density and magnetic flux.
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