Question

A square metal loop of side 10 cm and resistance 1 Ω is moved with a constant velocity partly inside a uniform magnetic field of 2 Wbm^–2, directed into the paper, as shown in the figure. The loop is connected to a network of five resistors each of value 3 Ω. If a steady current of 1 mA flows in the loop, then the speed of the loop is –

• A. 0.5 cms^–1
• B. 1 cms^–1
• C. 2 cms^–1
• D. 4 cms^–1

Answer 1

Answer: (C)

2 cms^–1

Answer 2

I = ⇒ 1 × 10^–3 = $\frac { 2 \times \mathrm { v } \times 10 \times 10 ^ { - 2 } } { 3 + 1 }$

v = 2 cm/ sec.