8- Which of the following diagrams represents the magnetic...

8- Which of the following diagrams represents the magnetic field due to a circular current? 9- A straight long wire carries an electric current to the right. The current is placed in a uniform magnetic field directed into the page. What is the direction of the magnetic force on the current? A. Left. B. Right. C. To the bottom of the page. D. To the top of the page. E. Out of the page. 10- Find the magnetic force per unit length between the two parallel wires carrying currents 3 A, 5 A and are separated by 1 m (?? = 4? × 10??)

Transcript

00:01 Okay, so for question 8, we are using the first right -hand rule to find the answer.

00:11 Okay, so which of the following diagram represents a magnetic field due to circular current.

00:18 Okay, so we use the right hand and we use the four fingers, okay, to grab the circle, okay, or to grab the circular current.

00:32 The finger is pointing the direction of the the fur fingers are pointing the direction of the circular current and the thumb the direction of the thumb will point to the direction of the magnetic field okay so in this way we know that b is the correct diagram represents the magnetic field due to the circular current okay so the answer is b, okay.

01:05 So question number eight, we choose b.

01:13 B is a correct answer.

01:15 Now for question number nine, okay.

01:25 The question is a street long wire, current is an electric current to the right.

01:33 The current is placed in a uniform magnetic field directed into the page.

01:40 What is the direction of magnetic form? on the current, okay? so the answer is, okay, here we use this magnetic force, magnetic force rule, okay? we still use our right hand.

02:02 And from the graph, you can see that the current, we use the sum to represent the direction of the current, which is to the right, and the magnetic field is into the page.

02:18 So therefore, if you try this by yourself, you know that the magnetic force is pointing up...

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