Question

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Question 4 (1 point) As shown in the figure, a wire and a 10-12 resistor are used to form a circuit in the shape of a square with dimensions 20 cm by 20 cm. A uniform but non-steady magnetic field is directed into the plane of the circuit. The magnitude of the magnetic field is steadily decreased from 2.70 T to 0.90 T in a time interval of 96 ms. What is the induced current in the circuit, and what is its direction through the resistor? x x x 1 X X X 20 cm * x ww 10 75 mA, from b to a 45 mA, from b to a 45 mA, from a to b 75 mA, from a to b 110 mA, from a to b Question 5 (1 point)

Answer 1

75mA ,from b to a

Given: R=lour area, A=(20x103) and = 400x104 m² dB= (0.go-2.70)T dB =-1.8T At=g6x103 We know that emf induced, d (BA) dt dt e=- A dB = (400x10% x-1.8 96X103 dt ie=0.75 volt Now, current through coil is, ie 0.75 R = 0.075A 10 i.e., i = 75x10²A - i= 75mA x xxx Now the direction x x x x T of magnetic field w b is in to the page in which circuit is present This magnetic field is decreases steadily, So according to tena law the direction of current produced in circuit is clockwise therefore Current flows from b to a.