Question

If the rectangular coil used in the moving coil galvanometer is made circular, then what will be the effect on the maximum torque acting on the coil in magnetic field for the same area of the coil?​

Answer 1

Answer:

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Explanation:

Let l and b be the length and breadth of the coil respectively. Effective area =A

If θ is the angle formed by direction of magnetic field with normal drawn on the plane of coil , then

Torque τ=NIBAsinθ

With radial magnetic field θ=90

τ=NABI

Answer 2

The maximum torque acting on the coil in the same magnetic field will be 90°

Explanation for the above answer:

• Let us consider l = length of the coil and b = breadth of the coil.
• The Magnetic field is drawn normal to the plane of the coil, the angle between them θ=90°.(Magnetic field is per[pendicular to the field of the coil)
• By using the torque formula,
• torque = NIBASinθ
• θ=90° hence, Sinθ= 1
• torque = NIBA
• where,

1. B - magnetic field
2. A - area of the surface
3. I- dipole moment
4. N - No: of turns per unit length