Electric Charges and Fields

JEE Main 2025 (Online) 22nd January Morning ShiftMCQMedium📈 Topic in 18% papers+4−1

Ques. 1JEE Main 2025, 22 January (Morning Shift)

A line charge of length a2 is kept at the center of an edge BC of a cube ABCDEFGH having edge length ' a ' as shown in the figure. If the density of line charge is C per unit length, then the total electric flux through all the faces of the cube will be . (Take, 0 as the free space permittivity) [figure]

a2 0
a8 0
a4 0
a16 0

Answer

(2) a8 0

Solution

The line charge q= a2 lies along edge BC; four identical cubes share this edge (end view).

[figure]

By symmetry each cube gets 14 of the total flux q 0

= 14 a2 0= a8 0

Answer: (2)

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Ques. 2JEE Main 2025, 22 January (Morning Shift)

An electron is made to enter symmetrically between two parallel and equally but oppositely charged metal plates, each of 10 cm length. The electron emerges out of the electric field region with a horizontal component of velocity 106 m/s. If the magnitude of the electric field between the plates is 9.1 V/cm, then the vertical component of velocity of electron is (mass of electron =9.1 10-31 kg and charge of electron =1.6 10-19 C )

1 106 m/s
16 106 m/s
16 104 m/s
0

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