Question

A thin square coil has 39 turns of conducting wire. It is rotating with constant angular velocity in a uniform 0.370 T magnetic field. At times there is no magnetic flux through the coil, and at other times there is the maximum possible flux. The graph below shows the magnetic flux Φ through the coil as function of time.

Length of 1 side of the coil: Correct, 6.37E-02 m

Angular velocity of the coil: Correct, 7.60E+00 rad/s

5. [1pt]
Evaluate the magnitude of the induced voltage in the coil at time t = 2.40 s.

Hint: Remember Faraday's Law? Where does the number of turns figure?

6. [1pt]
The total electrical resistance of the coil of wire is 3.14 Ω. Calculate the power dissipated at time t = 2.40 s.

Please help with the last two sub-questions

***(Answers dont seem to be 0.69 V or 0.15 W)***

Answer 1

5)

here by using the formula

V = w * N * B * l^2

V = 7.6 * 39 * 0.37 * ( 6.37 * 10^-2)^2

V = 0.45 volts

6)

P = V^2 / R

P = 0.45^2 / 3.14

P = 0.0645 watt