It would be safe to stand on the insulated sphere since it is covered by a material that does not allow the passage of current or an insulator. With the insulator, the student can freely touch the sphere but without it, touching the sphere when it is charged is very dangerous as it would electrocute you since the charge from the sphere would freely flow onto your body. Insulators are being used to be able to protect humans from any danger in touching charged objects. Insulators have very high resistance to the flow of current through them. Examples are rubber, glass, cellulose, polystyrene and wood.
Answer:
Explanation:
The whole surface of hollow sphere = 4π r²
= 4 x 3.14 x (10 x 10⁻²)²
= 12.56 x 10⁻² m²
Area of the hole ( both side ) = 2 x π r²
= 2 x 3.14 x (10⁻³)²
= 6.28 x 10⁻⁶ m²
flux coming out of given charge at the centre as per Gauss's theorem
= q / ε₀ where q is charge at the centre and ε₀ is permittivity of the medium .
= 10 x 10⁻⁶ / 8.85 x 10⁻¹²
= 1.13 x 10⁶
This flux will pass through the surface of sphere so flux passing through per unit area
= 1.13 x 10⁶ / 12.56 x 10⁻²
= 8.99 x 10⁶ weber per m²
flux through area of hole
= 8.99 x 10⁶ x 6.28 x 10⁻⁶
= 56.45 weber .
Answer: The latitudinal value of tropic of cancer is 23.5° N on June 21, when the sun is directly up above the head at noon. The Equator is the circle at which sun is straight above the head.
Explanation:
A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. Forces only exist as a result of an interaction
Answer:
No force is generated
Explanation:
Solution:-
- The reason that current carrying parallel wires exert forces between them is that the magnetic field of the one is perpendicular to the velocity of the electrons in the other one (current = moving electrons).
- The magnetic force Fm is given by the cross product of velocity vector (v) and strength of magnetic field (B):
Fm = q* ( v x B ).
- In perpendicular (current carrying) wires, the magnetic field of one wire is in parallel with the velocity of the electrons in the other one, and, thus, no force is generated.
Fm = q * // ( v x B )
= q * ( 0 ) = 0
- The cross product of parallel vectors is zero.