TEE 209/05 4 (4 marks) 3. (a) Table 1 gives the current i (in amperes) through D

Question

TEE 209/05 4 (4 marks) 3. (a) Table 1 gives the current i (in amperes) through Device 1 and Device 2 when several values of potential difference V (in volts) is applied. From these data, which device does not obey Ohm's law and why? Table 1: Current i through two devices Device 1 Device 2 2.00 3.00 4.00 4.50 6.75 9.00 2.00 3.00 4.00 1.50 2.20 2.80 (b) Figure 4 shows the rotation of a single loop wire coil when (3 marks) a current is being passed through. The direction of the field B is parallel to the x-axis. The force on a straight conductor is given by F-1jd1xB =ILB where l and L are the current and length of the conductor respectively. State whether the coil will rotate clockwise or anti-clockwise when view from the direction of the z axis. View from this direction Figure 4: Rotation of coil

Explanation / Answer

for device 1

resistance = 2/4.5 = 0.4444444444444444......

V/R = I

3/resistance = 6.75

4/resistance = 9

it means it follows ohms law

now check for device 2

resiresist = 2/1.5 = 4/3 = 1.33333333..........

3/resistance = 2.25

4/reresistan = 3

so you can see for voltages 3 and 4 we are getting different result by applying ohms law so this device is not following ohms law.

b) now suppose current is flowing in the loop in clockwise direction when you take dlxB you will see from z direction that loop is rotating in clockwise direction.

now suppose current is flowing in the loop in anticlockwise when you take dlxB you will see that loop is rotating in anticlockwise.

please do not give thumbs down right away let me know in comment section if you don't understand it I will help.

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