1
CBSE 12th Physics (Term 1) Paper 2021-22
+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
$${1 \over {\sqrt 2 }}{{kq{q_0}} \over {{a^2}}}$$
2
CBSE 12th Physics (Term 1) Paper 2021-22
+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
3
CBSE 12th Physics (Term 1) Paper 2021-22
+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
$${F \over 2}$$
4
CBSE 12th Physics (Term 1) Paper 2021-22
+0.77
-0
Two charges 14 $$\mu$$C and $$-$$4 $$\mu$$C are placed at ($$-$$12 cm, 0, 0) and (12 cm, 0, 0) in an external electric field $$E = \left( {{B \over {{r^2}}}} \right)$$, where B = 1.2 $$\times$$ 106 N/(cm2) and r is in metres. The electrostatic potential energy of the configuration is
A
97.9 J
B
102.1 J
C
2.1 J
D
$$-$$97.9 J
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