How far must a girl stand in front of a concave spherical mirror of radius 120cm to see an erect image of her face four times its natural size?
If an α-particle is projected normally through a uniform magnetic field, then the path of the α-particle inside the field will be
Which among the following is the necessary condition for simple harmonic motion?
A long jumper runs before jumping because he
The force experienced by a unit positive test charge placed at a point is called
Which one of the following is the value of current I in the circuit shown above?