# Physics

A circular loop of wire of radius 0.10 m and of resistance 2.0 x 10^−3 ohms is in a region where there is a uniform magnetic field B.

The field is at 30deg to the normal to the plane of the wire loop as shown in Figure 3. The magnitude of the
magnetic field falls at a steady rate from 6.0 x 10^−2 T to zero in 2.0 seconds.
What is the value of the current flowing round the wire loop while the field is decreasing?

I get 0.8A

1. 👍 0
2. 👎 0
3. 👁 145
1. I = (induced emf)/R

Induced emf = (area)(dB/dt)* cos 30
dB/dt = 0.03 T/s
Area = (pi/4)R^2 = 7.85*10^-3 m^2

1. 👍 0
2. 👎 0
posted by drwls

## Similar Questions

1. ### Physics

Would someone check this please? A circular loop of wire of radius 0.10 m and of resistance 2.0 ~ 10−3 ƒ¶ is in a region where there is a uniform magnetic field B. The field is at 30‹ to the normal to the plane of the

asked by charlie on June 18, 2009
2. ### Physics

Would someone check this please? A circular loop of wire of radius 0.10 m and of resistance 2.0 x 10^−3 ohms is in a region where there is a uniform magnetic field B. The field is at 30deg to the normal to the plane of the wire

asked by charlie on June 19, 2009
3. ### Physics

Figure shows a circular wire loop of radius r carrying current i placed in a perpendicular magnetic field B. Suppose that the radius of cross section of the wire is a. Find the decrease in radius of loop when magnetic field is

asked by Aaron on September 28, 2016

A piece of copper wire is formed into a single circular loop of radius 13 cm. A magnetic field is oriented parallel to the normal to the loop, and it increases from 0 to 0.70 T in a time of 0.45 s. The wire has a resistance per

asked by Mary on October 9, 2007
5. ### Ap physics b

A piece of copper wire is formed into a single circular loop of radius 11 cm. A magnetic field is oriented parallel to the normal to the loop, and it increases from 0 to 0.65 T in a time of 0.45 s. The wire has a resistance per

asked by christina on April 6, 2011
6. ### Physics

A piece of copper wire is formed into a single circular loop of radius 13 cm. A magnetic field is oriented parallel to the normal to the loop, and it increases from 0 to 0.70 T in a time of 0.45 s. The wire has a resistance per

asked by Mary on October 4, 2007
7. ### Physics

A small sphere has a hole drilled in it and it is placed onto a wire. The wire is bent into a circle of radius 15 centimeters. The sphere can slide freely without friction around the circular wire. The circular wire is held

asked by Kyle on November 24, 2015
8. ### Physics repost

Please help!! I have tried everything and is still coming up with and incorrect answer. A piece of copper wire is formed into a single circular loop of radius 13 cm. A magnetic field is oriented parallel to the normal to the loop,

asked by Mary on October 10, 2007
9. ### Physics repost

I know I have posted this question before but I have tried everything under the sun to no avail. Please help a clueless student!!!! A piece of copper wire is formed into a single circular loop of radius 13 cm. A magnetic field is

asked by Mary on October 11, 2007
10. ### physics

A long, vertical, straight wire carries a current I going upwards. The wire is perpendicular to the plane of a circular metal loop and passes through the center of the loop. The loop is allowed to fall and maintains its

asked by josh on July 28, 2010

More Similar Questions