A wheel with 10 metallic spokes each 0.5 m long is rotated with a speed of 120 rev/min, in a plane normal to earth's magnetic field at the place. If the magnitude of the field is 0.40 G, what is the induced e.m.f. between the axle and rim of the wheel?

What type of questions asked from the lesson of magnetic effect of electric current 

Wavelength of green light is

A) 400-450 nm

B) 500-550 nm

C) 660-720 nm

D) 720-800 nm

What is the difference between anaerobic & aerobic respiration? Name some organism that uses the aerobic mode of respiration?

What are the main components of our environment? Explain each of them briefly.

What are examples of hydrotropism plants?