a solid insulating sphere of radius r
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a solid insulating sphere of radius r
a solid insulating sphere of radius a
a solid insulating sphere has radius r
a solid sphere of radius r
a solid nonconducting sphere of radius r
a uniform solid sphere of radius r
a spherical insulator of radius r
a solid sphere of radius r acquires
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critical radius of insulation for sphere
electric field inside solid insulating sphere
two insulating small spheres are rubbed
a solid insulating sphere of radius r, a solid insulating sphere of radius a, a solid insulating sphere has radius r, a solid sphere of radius r, a solid nonconducting sphere of radius r, a uniform solid sphere of radius r, a spherical insulator of radius r, a solid sphere of radius r acquires, a small sphere of radius r, a solid sphere of radius r gravitationally, a sphere of radius r, a solid conducting sphere of radius r1, a small conducting sphere of radius r, a spherical surface of radius r, a hollow sphere of radius r, a solid ball of radius r, a thin metallic sphere of radius r, a solid spherical conductor of radius r, critical radius of insulation for sphere, electric field inside solid insulating sphere, two insulating small spheres are rubbed