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Artist 52 [7]
3 years ago
14

Why are moving iron instrument are of repulsion type

Physics
1 answer:
never [62]3 years ago
5 0

Answer:

he spring provides the controlling torque. The air friction induces the damping torque, which opposes the movement of the coil. The repulsion type instrument is a non-polarized instrument, i.e., free from the direction of current passes through it. Thus, it is used for both AC and DC

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The magnetic field of a long, straight, and closely-wound solenoid, inside the solenoid at a point near the center, is 0.645 T.
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Explanation:

Given that

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We know that magnetic filed in the solenoid is given as

B=\mu _0 n\ I

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n=Number of turn per unit length

μ0 =magnetic permeability

Now when the current increased by 3 factors

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B'=3 B

That is why

B' = 3 x 0.645 T

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