Suppose a plano — convex lens is placed on an optically f‌iat glass plate. The radius of the lens is 3m and the lens is illuminated by monochromatic light. What is the wavelength of the light used. if the radius of the 8”1 dark ring is 4.2mm?

What is the force on a conductor of the length 60 cm carrying a current of 5A which is placed perpendicular to a magnetic field of induction 4 x10'3 T?

Consider two slits that are 0.5 mm apart. These slits are illuminated by the light of wavelength 5000 A. What is the separation between the second bright fringe on both the sides of central maximum, if the screen is placed at 1 m distance from the slits?

Three parallel conductors X, Y, and Z are carrying currents as shown in the f‌igure. If the length of each of the conductor is 10 m, then what is the magnitude and direction of the resultant force on the conductor Y?

What is the correct wavelength range of the visible light?

What is the approximate value of maximum forward voltage for the visible-light LED?

If an object is rotating clockwise, this corresponds to a _____ angular velocity.

Fluid intelligence includes _____.

A spinning neutron star has been observed at the center of a ________.

According to the concept of punctuated equilibrium, _____.

Compared to type a axons, type c axons are __________.