A highly conducting ring of radius `R` is perpendicular to and concentric with the axis of a long solenoid as shown in Fig. 3.182. The ring has a narrow gap of width `delta` in its circumference. The cross-sectional area of the solenoid is a. The solenoid has a unifoem unitial field of magnitude `B(t) = B_(0) + betat`, where `beta gt 0`. Assuming that no charge can flow across the gap, the face (s) accumulating an excess of positive charge is /are

Options

A. (a) `F_(1)`
B. (b) `F_(2)`
C. ( c) `F_(1) and F_(2)` both
D. (d) difficult to conclude as data given are insufficient

Answer

A, D

Explanation

(a,d): Apply Lenz's law