Question

In the circuit with a coil resistance $2\Omega$, the magnetic flux changes from $2wb$ to $10wb$ in $0.2second$. The charge that flows in the coil during this time is:

• A. $5coulomb$
• B. $4coulomb$
• C. $1coulomb$
• D. $0.8coulomb$

Answer 1

Answer: (B)

$4coulomb$

Given:

Changing from 2 wb to 10 wb in 0.2 sec

$R=2\Omega$

$\Delta Q=\frac{\Delta \varphi }{R}=\frac{{\varphi }_2-{\varphi }_1}{R}=\frac{(10-2)}{2}=4C$