**Answer:**

The number of turns, N = 1750

**Explanation:**

It is given that,

The inner radius of a toroid, r = 12 cm

Outer radius, r' = 15 cm

The magnetic field at points within the coils 14 cm from its center is,

R = 14 cm = 0.14 m

Current, I = 1.5 A

The formula for the magnetic field at some distance from its center is given by :

**N = 1750**

**So, the number of turns must have in a toroidal solenoid is 1750. Hence, this is the required solution.**

Less force will be necessary to overcome **inertia** for the 80 kg piece of furniture.

Force is a factor that has the power to alter an object's motion. A massed object's velocity can be changed or accelerated by a force. A push or a pull is a straightforward method to explain forces.

The term "moment of **inertia**" refers to the quantity that describes how a body resists angular acceleration and is calculated by multiplying each particle's mass by its square of the distance from the rotational axis.

I = mr², where m is the mass of the object and r is the distance to the rotation axis.

Therefore, The **inertia **is directly proportional to the mass of the object.

So, as the mass increases the **inertia** increases.

Therefore, 80 kg piece of furniture will require less force to overcome **inertia**.

Learn more about **inertia **here:

brainly.com/question/14460640

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I think the answer is B but not too sure.

Answer:

V4=9.197v

Explanation:

Given:

V1= 18v ,V2= 12v ,r1=r5=58ohms ,r2=r6=124ohms , r3=47ohms ,r4= 125ohms

V4= I4R4 = V2/(R4 + R5)×R4

V4= 12×125 /(125 + 58)

V4=1500/183 =9.197v

Fc=mv2/r formula of centripetal force will be applied here with radius mass and velocity described in the above question