In a demonstration, a 4.00 cm2 square coil with 10 000 turns enters a larger square region with a uniform 1.50 T magnetic field at a speed of 100 m/s. The plane of the coil is perpendicular to the field lines. If the breakdown voltage of air is 4 000 V/cm on that day, the largest gap you can have between the two wires connected to the ends of the coil and still get a spark is:

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Muscardinus Muscardinus · Answer 1 · 2019-08-08T09:20:00+02:00

Explanation:

It is given that,

Area of square coil, [tex]A=4\ cm^2=0.0004\ m^2[/tex]

Side of the square, L = 0.02 m

Number of turns, N = 10000

Uniform magnetic field, B = 1.5 T

Speed, v = 100 m/s

An emf is induced in the coil which is given by :

[tex]E=NBLv[/tex]

[tex]E=10000\times 1.5\times 0.02\times 100[/tex]

E = 30000 V

Breakdown voltage of air, [tex]V=4000\ V/cm=400000\ V/m[/tex]

Let d is the gap between the two wires connected to the ends of the coil and still get a spark. So,

Electric field, [tex]E'=\dfrac{V}{d}[/tex]

[tex]\dfrac{30000}{d}=400000[/tex]

d = 0.075 m

Hence, this is the required solution.