Question

i need help with 5,6and 7

alschami (saa4537) - Homework7 - sharma - (PH106-005) 005 (part 1 of 3) 10.0 points 6.1 = |_ RB sinut A rectangular loop of copper wire of resis- 007 (part 3 of 3) 10.0 points tance R has width a and length b. The loop Select a graph of the induced current I vswt, is stationary in a uniform magnetic field. The taking clockwise current to be positive. magnetic field B at time t = 0 seconds is di- rected into the page as shown below. The uniform magnetic field varies with time t ac- cording to the relationship B = Bocoswt. where w and Boare positive constants and B is positive when the field is directed into the 1. -------------- ---- page. B - -- --+ - 3 -- 2 -- 5 34 kle The direction of the induced current in the loop when wt = after the magnetic field begins to oscillate is 1. clockwise. 2. counter-clockwise. --- - - - - - - - 3. undetermined, since the current is zero. 006 (part 2 of 3) 10.0 points What is the expression for the magnitude of the induced current in the loop as a function of time in terms of a, b, Bo, W. RI, and fundamental constants. H-- 1. I = abw BoRsin wt| -- ------ - 2x 5 36 2. I = 0 sinw | 3. I RUB sint 4.1 = abw Bo | sin wt1 AAAA -- -- 5. -- 0 ab Bo sint --- -- ------ 34 35 36 -- WR

Answer 1

Emf induced in the rectangular coil is E =-dd dlt X BA 1 Here B i varying oith time according to the relahon, B Bo coswt is constant which but Area - A I equal to axb sab Now dlab Bo coswt) E - dt = +ab Bo (5in wt)w sin wt) ab Bow Now VIR So Iab Bo sinwt I: R R

60, for part U):- into the page Initially magnehic field and itis AAA maximum at t=0 and is dlecreasing with time at creasing, wt = /2, magnehic tield is de So current will be induced at wt - in clockwibe direchon ,acc. to lenz's law. bo anbwer = (1) Clockwibe For part2): Answer = (4) T abw Bo for part 3):- Answer (2) I wt --. 2オ 57 3ズ 2 2 +l KIN