There might not be enough information for the 1st question but if anything you c

Question

There might not be enough information for the 1st question but if anything you can tell please do so. Thank you.

QUESTION 1

The experiment as described would not work if the currents in the wires were flowing in the same direction because:

A) If flowing in the same direction the force between the wires is repulsive and therefore cannot be counter-balanced by the mass

B) If flowing in the same direction the force between the wires is attractive and therefore cannot be counter-balanced by the mass

C) This would damage the wires

D) In this case there would be no magnetic field generated by the wires

QUESTION 2

A very long wire carries a current of I = 2 A. The magnetic field in a point a distance r = 2 cm from the wire is

A) 2 × 10-5 T

B) 2 × 10-7 T

C) 1 × 10-5 T

D) 0.001 T

Question 3

A very long wire carries a current of I = 2 A. The magnetic field in the region around the wire

A) Points radially away from the wire

B) Circles around the wire in closed loops

C) Is parallel to the wire

D) Is zero

QUESTION 4

Two parallel wires of lengths L = 0.2 m both carry equal currents of I = 2.5 A. The wires are a distance d = 0.05 m apart. The force on the wires is

A) 2 × 10-6 N

B) 4 × 10-6 N

C) 5 × 10-6 N

D) 2 × 10-4 N

QUESTION 5

Two parallel wires of lengths L both carry equal currents I. The wires are a distance d apart. If the current through both wires is doubled then the force between the wires will

A) Double

B) Increase by a factor 4

C) Increase by a factor (2)

D) Actually it stays the same

QUESTION 6

In the experiment described for the lab, if the the mass on the moveable conductor is doubled the current will have to be

A) Doubled

B) Increased by a factor 4

C) Increased by a factor (2)

D) Actually it stays the same

Explanation / Answer

1) the experiment is about two current carrying conductors and focre acting on each other.

When the direction of current in both wires is same , they experience force of attraction towards each other. So the answer is ( B)

2) magnetic field due to a long wire

B = u/2pai x I /d ( u= permittivity of free space )

= 2*10^-7 × 2/ 2*10^-2

= 2 *10^-5 T ( A )

3) answer is (B) circles around in closed loops

5 ) The force between the wires

F ia proportional to product of current in two wires

So if value of current in both wires is doubled then force will be increased by a factor of 4 ( B )

6) in the experiment when mass on the movable wire is doubled .The attractive froce between the qire need to be doubled to counter it.

For this the current in both wires need to be increased by factor of _/ 2 (C )

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