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JEE Advanced Model Paper 5 with solutions for online practice
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Question : 7
Total: 54
A square frame ABCD is made of insulating wires. There is a short dipole, having dipole moment p, fixed in the plane of the figure lying at the center of the square, making an angle θ as shown in figure. Four point charges are placed at the four cornersof the square as shown in the figure. Select the correct alternative(s)
Magnitude of electrostatic force on the system of four charges due to dipole is independent of orientation ofdipole
Magnitude of electrostatic force on the system of four charges due to dipole is dependent on orientation ofdipole
Net torque on the system of four charges about the centre of the square due to dipole is zero
Net force on the system of four charges due to dipole is in positive Y direction if θ = 45°
Validate
Solution:
Answer (A, C, D)
F
y
=
3
K
p
q
s
i
n
θ
r
3
× 2
F
x
=
3
K
p
q
r
3
cosθ × 2
F =
√
F
x
2
+
F
y
2
=
6
K
p
q
r
3
Net torque will be zero since force perpendicular todiagonal ends are equal.
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