1
CBSE 12th Physics (Term 1) Paper 2021-22
MCQ (Single Correct Answer)
+0.77
-0
A square sheet of side 'a' is lying parallel to XY plate at z = a. The electric field in the region is $$\overrightarrow E = c{z^2}\widehat k$$. The electric flux through the sheet is
A
a4c
B
$${1 \over 3}$$a3c
C
$${1 \over 3}$$a4c
D
0
2
CBSE 12th Physics (Term 1) Paper 2021-22
MCQ (Single Correct Answer)
+0.77
-0
Three charges q, $$-$$q and q0 are placed as shown in figure. The magnitude of the net force on the charge q0 at point O is $$\left[ {k = {1 \over {(4\pi { \in _0})}}} \right]$$

A
0
B
$${{2kq{q_0}} \over {{a^2}}}$$
C
$${{\sqrt 2 kq{q_0}} \over {{a^2}}}$$
D
$${1 \over {\sqrt 2 }}{{kq{q_0}} \over {{a^2}}}$$
3
CBSE 12th Physics (Term 1) Paper 2021-22
MCQ (Single Correct Answer)
+0.77
-0
A + 3.0 nC charge Q is initially at rest at a distance of r1 = 10 cm from a + 5.0 nC charge q fixed at the origin. The charge Q is moved away from q to a new position at r2 = 15 cm. In this process work done by the field is
A
1.29 $$\times$$ 10$$-$$5 J
B
3.6 $$\times$$ 105 J
C
$$-$$4.5 $$\times$$ 10$$-$$7 J
D
4.5 $$\times$$ 10$$-$$7 J
4
CBSE 12th Physics (Term 1) Paper 2021-22
MCQ (Single Correct Answer)
+0.77
-0
Four objects W, X, Y and Z, each with charge +q are held fixed at four points of a square of side d as shown in the figure. Objects X and Z are on the midpoints of the sides of the square. The electrostatic force exerted by object W on object X is F. Then the magnitude of the force exerted by object W on Z is

A
$${F \over 7}$$
B
$${F \over 5}$$
C
$${F \over 3}$$
D
$${F \over 2}$$
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