Question 1 3 pts A wire of initial length Lo and radius ro has a measured resistance of 2 Ohms. The wire is drawn under tensile stress to a new uniform radius of r-0.270 What is the new resistance of the wire? Hint: Assume the radius and the length of the wire can change. 1.250 Ohms 1,875 Ohms 69444 Ohms 3,375 Ohms None of the above Next →
A long wire carries a current in the direction shown above. The current I varies linearly with time t as follows: I=ct, where c is a positive constant. The long wire is in the same plane as a square loop of wire of side b, as shown in the diagram. The side of the loop nearest the long wire is parallel to it and a distance a from it. The loop has a resistance R and is fixed in space. a. Determine...
An infinite straight wire carries a current I that varies with time as shown above. It increases from 0 at t = 0 to a maximum value I_1 3.3 A at t = t_1 = 12 s, remains constant at this value until t = t_2 when it decreases linearly to a value l4 = -3.3 A at t = t_4 = 31 s, passing through zero at t = t_3 = 24 s. A conducting loop with sides W...
The drawing shows a straight wire carrying a current I. Above the wire is a rectangular loop that contains a resistor R. If the current I is decreasing in time, what is the direction of the induced current through the resistor R — left-to-right or right-to-left? If the induced current goes from left to right through the resistor, type the letters "LTR" in the box below. If the current goes from right to left through the resistor, type the letters...
An infinite straight wire carries a current I that varies with time as shown above. It increases from 0 at t = 0 to a maximum value l_1 = 2.7 A at t = t_1 = 14 s, remains constant at this value until t = t_2 when it decreases linearly to a value l_4 = -2.7 A at t = t_4 = 25 s, passing through zero at t = t_3 = 22 s. A conducting loop with sides...
An infinite straight wire carries a current I that varies with time as shown above. It increases from 0 at t = 0 to a maximum value I1 = 5.5 A at t = t1 = 12 s, remains constant at this value until t = t2 when it decreases linearly to a value I4 = -5.5 A at t = t4 = 31 s, passing through zero at t = t3 = 24 s. A conducting loop with sides...
elaborate on this quote. Does this mean that if I place a compass above the wire, the NORTH end of the compass will point towards the wire? like this? If so, can we imagine the wire as being the virtual magnet, where the "top" of the wire simulates a north pole and the "bottom" of the wire simulates a south pole? Why would this be? Is it because the field lines go from the north end of the magnet to...
An infinite straight wire carries a current I that varies with time as shown above. It increases from 0 at t = 0 to a maximum value 11 2.1 A att = t1 = 15 s, remains constant at this value until t = t2 when it decreases linearly to a value 4 = -2.1 A at t = t4 = 31 s, passing through zero at t = t3 = 25.5 s. A conducting loop with sides W 22...
An infinite straight wire carries a current l that varies with time as shown above. It increases from 0 at t to a maximum value l! = 3.9 A at t = t1 = 13 s, remains constant at this value until t t2 when it decreases linearly to a value 43.9 A at tt 23 s, passing through zero at t t 20.5 s. A conducting loop with sides W 23 cm and L 68 cm is fixed in...
18.3) Straight wire A long straight wire carries a current I(t) = I0e-kt. A rectangular loop of dimensions a x b is a distance d below the wire. Find the induced emf in the loop. What direction is the induced current?