Alternating Current - Result Question 10

10. In a region of uniform magnetic induction B=102 tesla, a circular coil of radius 30cm and resistance π2ohm is rotated about an axis which is perpendicular to the direction of B and which forms a diameter of the coil. If the coil rotates at 200rpm the amplitude of the alternating current induced in the coil is

(a) 4π2mA

(b) 30mA

(c) 6mA

(d) 200mA

[1988]

Topic 2: A.C. Circuit, LCR Circuit,

Quality & Power Factor

Show Answer

Answer:

Correct Answer: 10. (c)

Solution:

(c) I0=E0R=nBAωR

Given, n=1,B=102T,

A=π(0.3)2m2,R=π2

f=(200/60) and ω=2π(200/60)

Substituting these values and solving, we get I0=6×103A=6mA



NCERT Chapter Video Solution

Dual Pane