Hello guys, I need your help to explain and answer this questions please Hello g

Question

Hello guys, I need your help to explain and answer this questions please

Hello guys, I need your help to explain and answer this questions please 4) A ten-loop coil having an area of 0.23m^2 and a very large resistance is in a 0.047-T uniform magnetic field oriented so that the maximum flux goes through the coil. The coil is then rotated so that the flux through it goes to zero in 0.34s. What is the magnitude of the average emf induced in the coil during the 0.34 s? 35) A point charge Q moves on the x-axis in the positive direction with a speed of 280 m/s. A point P is on the y-axis at y = +70 mm. The magnetic field produced at the point P, as the charge moves through the origin, is equal to -0.30 muT kcap. What is the charge Q? (mu0 = 4pi x 10^-7 T.m/A)

Explanation / Answer

35. the relation between magnetic field and Electric field is B = EV/c^2

also Electric field E = KQ/r^2

where K is 9e9

Q is charge

r is the distance

so

KQ/r^2 = Bc^2/v

Q = Bc^2r^2/Kv

Q = (0.3 e-6 *3e8*3e8 * 0.070 *0.070)/(9e9 * 280)

Q = -53 uC option A it is --------------<<<<<<<<<<<<Answer

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induced emf is defiend as the rate of change of magnetic flux

in mathematical form,

induced emf e = NAdB/dt    or NABW   or   NA dB/dt cos theta

where A = area

N = no. of tunrs

W = angular frequency

dB/dt = rate of change of magnetic field

so

emf e = 10 * 0.23 * 0.047/0.34

emf e = 0.32 Volts option D it is --------------<<<<<<<<<<<<Answer

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