Dipoles

Q. A semi circular ring of radius $R$ as shown in figure has charge per unit length $\lambda ={\lambda }_o\cos \theta$. Electric dipole moment of this ring is

1. $\lambda R^2$
2. $2\lambda R^2$
3. $\frac{\lambda R^2}{2}$
4. $\frac{3}{2}\lambda R^2$

Q. Statement I: Dipole is a scalar Quantity.
Statement II: Dipole is a vector Quantity.

1. Statement I – True
   Statement II - True
   
2. Statement I – True
   ​Statement II - False
   
3. Statement I – False
   ​Statement II - True
   
4. Statement I – False
   ​Statement II - False