A coil of circular cross-section having 1000 turns and 4 cm2 face area is placed with its axis parallel to a magnetic field which decreases by 10-2 Wb m-2 in 0.01 s. The e.m.f. induced in the coil is :

Question

A coil of circular cross-section having 1000 turns and 4 cm2 face area is placed with its axis parallel to a magnetic field which decreases by 10-2 Wb m-2 in 0.01 s. The e.m.f. induced in the coil is : (A) 400 mV (B) 200 mV (C) 4 mV (D) 0.4 mV

Tardigrade Admin · Accepted Answer

ε = -(dφ/dt) ε = (100×4×10-4×10-2/01) = 4× 10-1 V

Q. A coil of circular cross-section having 1000 turns and 4 $c m^{2}$ face area is placed with its axis parallel to a magnetic field which decreases by $1 0^{- 2}$ Wb $m^{- 2}$ in 0.01 s. The e.m.f. induced in the coil is :

400 mV

200 mV

4 mV

0.4 mV

$ε = - \frac{d ϕ}{d t}$
$ε = \frac{100 \times 4 \times 1 0 ^{- 4} \times 1 0 ^{- 2}}{01}$
$= 4 \times 1 0^{- 1} V$

Q. A coil of circular cross-section having 1000 turns and 4 cm2 face area is placed with its axis parallel to a magnetic field which decreases by 10−2 Wb m−2 in 0.01 s. The e.m.f. induced in the coil is :