A coil having effective area A, is held with its plane normal to a magnetic field of induction B. The magnetic induction is quickly reduced to `25%` o

Question

A coil having effective area A, is held with its plane normal to a magnetic field of induction B. The magnetic induction is quickly reduced to `25%` o

A coil having effective area A, is held with its plane normal to a magnetic field of induction B. The magnetic induction is quickly reduced to `25%` of its initial value in `2s`. Then e.m.f. induced across the coil will be
A. `(3AB)/(8)`
B. `(3AB)/(4)`
C. `(AB)/(4)`
D. `(AB)/(2)`

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - A
`B_(2)=(25)/(100)B_(1)=(B_(1))/(4)`
`e=(phi_(1)-phi_(2))/(dt)=(AB_(1)-AB_(2))/(dt)`
`=(A)/(dt)(B_(1)-B_(2))`
`=(A)/(dt)(B_(1)-(B_(1))/(4))`
`e=(3AB_(1))/(4dt)=(3AB)/(4xx2)=(3AB)/(8)`

4 views Answered 2023-02-05 15:29