A magnetic field of flux density 1.0 Wb m -2 acts normal to a 80 turn coil of 0.01 m 2 area. If this coil is removed from the field in 0.2 second, the emf induced in it is

Question

A magnetic field of flux density 1.0 Wb m -2 acts normal to a 80 turn coil of 0.01 m 2 area. If this coil is removed from the field in 0.2 second, the emf induced in it is (A) 0.8 V (B) 5 V (C) 4 V (D) 8 V

Tardigrade Admin · Accepted Answer

φ1= BAN =1 × 0.01 × 80 φ1=0.8 wb φ2=0 e =-((φ2-φ1)/ t ) =-((0-0.8/2))=4 V

Q. A magnetic field of flux density $1.0 Wb m^{- 2}$ acts normal to a $80$ turn coil of $0.01 m^{2}$ area. If this coil is removed from the field in $0.2$ second, the emf induced in it is

$0.8 V$

$5 V$

$4 V$

$8 V$

$ϕ_{1} = B A N = 1 \times 0.01 \times 80$
$ϕ_{1} = 0.8 w b$
$ϕ_{2} = 0$
$e = - \frac{( ϕ _{2} - ϕ _{1} )}{t}$
$= - (\frac{0 - 0.8}{2}) = 4 V$

Q. A magnetic field of flux density 1.0Wbm−2 acts normal to a 80 turn coil of 0.01m2 area. If this coil is removed from the field in 0.2 second, the emf induced in it is

0.8V

5V

4V

8V