A wire loop has an area of 0.12 m^2, and the magnetic field through it increases from 0 to 0.20 T in 0.30 s. What is the induced emf in the loop?

A. 0.80 V

B. 0.080 V

C. 0.024 V

D. 0.0072 V

Question

A wire loop has an area of 0.12 m^2, and the magnetic field through it increases from 0 to 0.20 T in 0.30 s. What is the induced emf in the loop?

A.       0.80 V

B.       0.080 V

C.       0.024 V

D.       0.0072 V

michele_laino · Answer

the magnetic flux change is:
$$\large  \Delta \Phi  = \left( {0.2 - 0} \right) \times 0.12 = ...Weber$$

anonymous · Answer

0.024? choice C is our solution?

michele_laino · Answer

no, since the magnitude of the requested emf is given by the subsequent formula:
$$\large  E = \frac{{\Delta \Phi }}{{\Delta t}} = \frac{{0.024}}{{0.3}} = ...volts$$

anonymous · Answer

ohh okay! so now we get 0.08?so it should be choice B is the solution?

michele_laino · Answer

yes! correct!

anonymous · Answer

yay! thank you!!:)

michele_laino · Answer

:)