An annular disc of copper with inner and outer radii r and R is rotating with a uniform angular speed w in a region where a uniform magnetic field B exists as shown. Then net emf induced between the inner edge and outer edge of the disc is

see full answer

High-Paying Jobs That Even AI Can’t Replace — Through JEE/NEET

🎯 Hear from the experts why preparing for JEE/NEET today sets you up for future-proof, high-income careers tomorrow.

An Intiative by Sri Chaitanya

$\frac{1}{2} B ω r^{2}$

Zero

$\frac{1}{2} B ω (R^{2} - r^{2})$

$\frac{1}{2} B ω (R - r)^{2}$

answer is D.

(Unlock A.I Detailed Solution for FREE)

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

$\begin{array}{l} dE = (Bdx) xω; E = \int_{r}^{R} Bωxdx; E = Bω {[\frac{x^{2}}{2}]}_{r}^{R} \\ E = \frac{Bω}{2} (R^{2} - r^{2}) \end{array}$

Watch 3-min video & get full concept clarity

No courses found

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test