48 please 45) A rectangular loop of wire that can rotate about an axis through i

Question

48 please

45) A rectangular loop of wire that can rotate about an axis through its center is placed between the 4) the koop L is 0.16 m and its width tw is 0.040 m. What is the nagnetic flux through the loop when the A) 2.6 x 103 T-m2 B) 2.6 x 10-3 T m2 13 x 10-3T m2 OT m2 E) 0.80T m2 46A resist rand an inductor reconnected nser ath a battery. Theti neconstantforthec rait 46) represents the time required for the current to reach A) 37% of the maximum current. 100% of the maximum current. 03% of the maximum current. of the maximum current. E) 75% of the maximum current. 47) what is the impedance at 1500 Hz if a 100 resistor, 20. mhi coil, and 1.0-uF capacitor are 47) connected in series? A) 0.19 ko B)82 13k0 D) 0.11 k A8) 48) A constant uniform magnetic field of 0.39 is applied at right angles to the plane of a flat rectangular loop of area 3.0x 10-3 m2. If the area of this loop chariges steadily from its original value to a new value of 1.6x 10-3 m2 in 1.6 s, what is the emf induced in the loop? A A)1.6x10-2 v B)7.5 × 10-2 v - D) 9.0 × 10-2 v E) 4.4x 10-4 v 49) Inductors store energy by accumulating excess charge within their coils. se .A) True 1500 )- -loo.l

Explanation / Answer

We know that by lnz law,

induced EMF is

E=d/dt

where is B.A

and B is magnetic field and A is the area of the loop.

So

E=d(B.A)/dt

as B is constant,

E=B.dA/dt

Now as B is perpendicular to the plane of the loop so,

angle between B and A vector will be zero.

So

E=BdA/dt.cos0

E=0.5*(3-1.6)10-3/1.6

E=0.4375*10-3 or 4.4*10-4V

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