NEET-XII-Physics
01: Electric Charges And Fields
- #20-aIf the radius of the Gaussian surface were doubled, how much flux would pass through the surface? (b) What is the value of the point charge?Ans : Electric flux, Φ = -1.0 × 103 N m2/C
Radius of the Gaussian surface,
r = 10.0 cm
Electric flux piercing out through a surface depends on the net charge enclosed inside a body. It does not depend on the size of the body. If the radius of the Gaussian surface is doubled, then the flux passing through the surface remains the same i.e., -103 N m2/C.
(b) Electric flux is given by the relation,
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Where,
q = Net charge enclosed by the spherical surface
`` \epsilon``0 = Permittivity of free space = 8.854 × 10-12 N-1C2 m-2
∴
= -1.0 × 103 × 8.854 × 10-12
= -8.854 × 10-9 C
= -8.854 nC
Therefore, the value of the point charge is -8.854 nC.
- #20-bWhat is the value of the point charge?Ans : Electric flux is given by the relation,
Where,
q = Net charge enclosed by the spherical surface
`` \epsilon``0 = Permittivity of free space = 8.854 × 10-12 N-1C2 m-2
∴
= -1.0 × 103 × 8.854 × 10-12
= -8.854 × 10-9 C
= -8.854 nC
Therefore, the value of the point charge is -8.854 nC.