A square loop of wire lies in the plane of the page. A decreasing magnetic field

Question

A square loop of wire lies in the plane of the page. A decreasing magnetic field is directed into the page. The induced current in the loop is: counterclockwise clockwise zero up the left edge and from right to left along the edge thought the middle of the page In a purely capacitive circuit the current: leads the voltage by one - fourth of a cycle leads the voltage by one - half of a cycle lags the voltage by one - fourth of a cycle lags the voltage by one - half of a cycle is in phase with the potential difference across the plates Two long straight wires A and B are parallel and carry current in opposite directions. The currents are 15A.O A and 30 A respectively, and the wires are separated by 0.48 m. Calculate the magnetic field in tesla (both magnitude and direction) at a point midway between the wires. Calculate the force per unit length on wire B (both magnitude and direction). along the top edge

Explanation / Answer

(5)

(a)

the magnetic field is given by

B = muo i / 2 pi r

= 125 x 10-7 T

(b)

force per unit length is

F / l = 1875 x 10-7 N

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