Verified Solution • 2025–26 Session moderate

QAIPMT-2010-Ph-2084: NEET 2010 Physics - Class 12 AIPMT-2010-Ph-2084 Solution: A conducting circular loop is placed in a uniform magnetic…

A conducting circular loop is placed in a uniform magnetic field B = 0.025 T with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of

1\ \text{mm s}^{-1}

. The induced emf when the radius is 2 cm is

2\pi\mu V

\pi\mu V

\frac{\pi}{2}\mu V

2\mu V

Multiple Choice Options

A 900 $\Omega$ �
B 1800 $\Omega$ �
C 500 $\Omega$ �
D 1000 $\Omega$ �

Step-by-Step Verified Solution

Here, Resistance of galvanometer, G = 100 � Current for full scale deflection, I g = 30 mA = 30 _ 10 �3 A Range of voltmeter, V = 30 V To convert the galvanometer into an voltmeter of a given range, a resistance R is connected in series with it as shown in the figure. From figure, V = I g (G + R) _ R = V I g _ G = 30 30 _ 10 _ 3 _ 100 � = 1000 � 100 = 900 �

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