For two long parallel wires separated by a distance d , carrying currents I 1 and I 2 as in Fig. 28–10, show directly (Eq. 28–1) that Ampère’s law is valid (but do not use Ampère’s law) for a circular path of radius r ( r < d ) centered on I 1 : ∮ B → ⋅ d l → = μ 0 I 1 .
For two long parallel wires separated by a distance d , carrying currents I 1 and I 2 as in Fig. 28–10, show directly (Eq. 28–1) that Ampère’s law is valid (but do not use Ampère’s law) for a circular path of radius r ( r < d ) centered on I 1 : ∮ B → ⋅ d l → = μ 0 I 1 .
For two long parallel wires separated by a distance d, carrying currents I1 and I2 as in Fig. 28–10, show directly (Eq. 28–1) that Ampère’s law is valid (but do not use Ampère’s law) for a circular path of radius r (r < d) centered on I1:
Four very long straight parallel wires, located at the corners
of a square of side l,
carry equal currents I
perpendicular to the
page as shown in
Fig. 20-64. Determine
the magnitude and
direction of B at the
center C of the square.
-l-
FIGURE 20-64
Problem 73.
3:
6)
S
R
b
N
а
+| E
Emk ɛ = 400V, resistor R = 100, switch S and a toroid of N = 104 number of
turns are connected in series as shown in the figure. Height, Inner and outer radii
of the toroid are h = 10cm, a = 10cm and b = 20cm respectively. No current
flows through the toroid. Now the switch S is thrown dlosed at t=0. What is the
energy of the toroid at t=0,4s. Ho = 4 × 10-7()
a) 18,36J
b) 162,7J
c) 491,75J
d) 993,65J
e) 1641,56J
3. In the following figure, a current 1= 10 amps is set up in a long hair-pin conductor
formed by bendin a wire into a semieirele of radius R = 5.0 mm. Point b is midway
between the straight sections and so distant from the semicirele that each straight section
can be approximated as being an infinite wire, What are the (a) magnitude and (b)
direction (into or out of the page) of B at point "a" center of semi-circle.
(c) What are the (a) magnitude and (b) direction (into or out of the page) of B at point
"b" between the infinite wires.
b
a
Chapter 28 Solutions
Physics for Scientists and Engineers with Modern Physics
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