Question: Q. 7. A wheel with 8 metallic spokes each 50 cm long is rotated with a speed of 120rev/min in a plane normal to the horizontal component of the earth’s magnetic field. The earth’s magnetic field at the place is 0.4G and the angle of dip is 60. Calculate the emf induced between the axle and the rim of the wheel. How will the value of emf be affected if the number of spokes were increased?

C [CBSE O.D. I, II, III 2013]

Show Answer

Solution:

Ans.

H=Bcosθ=0.4cos60 =0.2G=0.2×104 T

This component is parallel to the plane of the wheel. Thus, the emf induced is

ε=12Hl2ω, where ω=2πf =12Hl2(2πf) ε=12×0.2×104×(0.5)2 ×2×3.14×12060

Long Answer Type Questions



विषयसूची

जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक