The resistance of a 2 m long tungsten wire whose cross-sectional area of 0.15 mm² will be 0.74 ohm.
<h3>What is resistance?</h3>
Resistance is a type of opposition force due to which the flow of current is reduced in the material or wire. Resistance is the enemy of the flow of current.
ρ is the resistivity of tungsten = 5.6×10⁻⁸ (ohm m)
The relation of resistance with length and thickness is given by ;
Hence, the resistance of tungsten wire will be 0.74 ohm.
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Linear expansivity, area expansivity and volume or cubic expansivity are
Answer:
Explanation:
l etme y lo saoc apr aotarsy r dealkten dpo
Yes, that's correct. Newton's formula for the gravitational force, stated in this form, was used by Cavendish to measure ' G '.
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Answer:
Acceleration of the particle is 4.45 m/s² and acceleration direction is towards the 8 kg point mass.
Explanation:
Let m₁ be 8 kg point mass and m₂ be 12 kg point mass and take direction along m₁ mass as positive x-axis. The separation between twp point masses is 50 cm. According to the problem, a particle of mass m is held between the two point masses m₁ and m₂.
Distance between m₁ and m, r₁ = 20 cm = 0.2 m
Distance between m₂ and m, r₂ = (50 - 20) cm =30 cm = 0.3 m
The particle of mass m experiences an attractive gravitational force due to both the point masses. Thus, the net force on the particle of mass m is :
F = F₁ + F₂
F₁ is acting along the positive x axis and F₂ is acting along the negative x axis.
Substitute the values of G, m₁, m₂, r₁ and r₂ in the above equation.
F = 4.45m N/kg
Acceleration of the particle = 
= 4.45 m/s²
The direction of acceleration of the particle is towards the 8 kg point mass.
