Verified Solution • 2025–26 Session moderate

QAIPM-2011-Ph-1826: NEET 2011 Physics - Class 12 AIPM-2011-Ph-1826 Solution: Charge q is uniformly spread on a thin ring of radius R. The…

Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency f Hz. The magnitude of magnetic induction at the center of the ring is

\frac{\mu_0 qf}{2\pi R}

\frac{\mu_0 qf}{2R}

\frac{\mu_0 q}{2fR}

\frac{\mu_0 q}{2\pi fR}

Multiple Choice Options

A p-type having electron concentration n e = 5 $\times$ _ 10 9 m $-$ _ 3
B n-type with electron concentration n e = 5 $\times$ _ 10 22 m $-$ _ 3
C p-type with electron concentration n e = 2.5 $\times$ _ 10 10 m $-$ _ 3
D n-type with electron concentration n e = 2.5 $\times$ _ 10 23 m $-$ _ 3

Step-by-Step Verified Solution

(n i ) 2 = n e _ n h (1.5 _ 10 16 ) 2 = n e (4.5 _ 10 22 ) So n e = 5 _ 10 9 Now n h = 4.5 _ 10 22 _ n h >> n e Hence, semiconductor is p-type and n e = 5 _ 10 9 m �3

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