A magnetic field of 2 × 10-2 T acts at right angles to a coil of area 100 cm 2 with 50 turns. The average emf induced in the coil is 0.1 V, when it is removed from the field in time t. The value of t is

Question

A magnetic field of 2 × 10-2 T acts at right angles to a coil of area 100 cm 2 with 50 turns. The average emf induced in the coil is 0.1 V, when it is removed from the field in time t. The value of t is (A) 0.1 sec (B) 0.01 sec (C) 1 sec (D) 20 sec

Tardigrade Admin · Accepted Answer

e=-(N(B2-B1) A cos θ/Δ t) ⇒ 0.1=(-50 ×(0-2 × 10-2) × 100 × 10-4 × cos 0°/ t ) ⇒ t =0.1 sec

Q. A magnetic field of $2 \times 1 0^{- 2} T$ acts at right angles to a coil of area $100 c m^{2}$ with $50$ turns. The average emf induced in the coil is $0.1 V$ , when it is removed from the field in time $t$ . The value of $t$ is

0.1 sec

0.01 sec

1 sec

20 sec

$e = - \frac{N ( B _{2} - B _{1} ) A c o s θ}{Δ t}$
$\Rightarrow 0.1 = \frac{- 50 \times ( 0 - 2 \times 1 0 ^{- 2} ) \times 100 \times 1 0 ^{- 4} \times c o s 0 ^{\circ}}{t}$
$\Rightarrow t = 0.1 sec$

Q. A magnetic field of 2×10−2T acts at right angles to a coil of area 100cm2 with 50 turns. The average emf induced in the coil is 0.1V, when it is removed from the field in time t. The value of t is