3. A long straight wire has a current running through it as shown. At point P, d

Question

3. A long straight wire has a current running through it as shown. At point P, directly below the wire, what is the direction of the magnetic field? a. into the page c. to the left b. out of the page d. to the right 4. Which circuit configuration will lead to the brightest light bulbs? Assume the bulbs are ídentical. a. Circuit I b. circuit II 12 V 12 V c. Both are equally bright. d. It is impossible to tell. Circuit II Circuit I . A rigid, circular metal loop begins at rest in a uniform magnetic field directed away fromyou as shown. The loop is then pulled through the field toward the right, but does not exit the field. What is the direction of any induced current within the loop? 8 88 8 8 8 a. clockwise b. counterclockwise c. no current is induced d. impossible to tell

Explanation / Answer

3)(b)Out of the page

using right hand rule, poiniting the thumb in direction of current, curved fingers gives the direction of B field

4)(a)Circuit 1

We know that

P = i^2R

in circuit 1 the current will be more as R will be less and more power delivered to both the resistances and they will glow more.

5)(b)Counter clockwise

The flux will be increasing, the current will be induced to appose the change and hence will be in CCW direction

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