12. Consider the circuit shown. 2 Resistors A, C and D have resistances of 11 Oh

Question

12. Consider the circuit shown. 2 Resistors A, C and D have resistances of 11 Ohm, 18.5 Ohm, and 7.3 Ohm respectively. Batteries B, E and F have emfs of 17.7 V, 6 V and 16 V respectively. Which of the following equations represents Kirchoffs loop rule as applied to the left simple loop (starting from the lower left corner). (I point) A. ?-17.7 + 18.5 * 12.6+11*1-0 B. O-17.7+ 18.5 *I,+ 6+11I,0 C. O 17.7+ 18.5 I,-6-11 1, 0 D. O 17.7+ 18.5 1,-6+11*1, 0 E. O 17.7-185 *1,-6-11 *1, 0 13. Determine the direction of the magnetic force acting on a negative charge going south in a region where the magnetic field is directed perpendicularly into the paper. (I point) A. Owest B. O perpendicularly out C. Oeast D. O perpendicularly in E. O north

Explanation / Answer

12] Since the loop is asked to be evaluated from the bottom left using Kirchoff's voltage rule, for the left loop, the equation will be:

- B + I1A - E + I2C = 0

=> - 17.7 + 11 I1 - 6 + 18.5I2 = 0

[answer - option A]

13] Use the right hand rule for cross products.

This gives the force to be in the west direction. [answer - option A].

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