Closed book/notes. No electronic devices other than FE approved calculators. You

Question

Closed book/notes. No electronic devices other than FE approved calculators. You have 50 minutes to complete this exam. Each problem carries the same weight. Work all problems. Choose the best answer by circling the letter. Problem 1. Say you reach to pet a cat on its head and when your hand is within a centimeter of its ear there is an are through the air between you and the cat (much to the cat's displeasure). If that arc was positive charge flowing from the cat to you, that would mean your voltage was the cat's voltage just prior to the arcing. A. less than B. equal to C. higher than D. voltage has nothing to do with the arcing Problem 2 I is not zero. Which statement is true. A. Neither Ii nor l2 are zero. B. Only I is zero. C. Only h is zero. D. Both I and l2 are zero.

Explanation / Answer

PROBLEM 1

Electric current is defined as the flow of positive charge from HIGH POTENTIAL to LOW POTENTIAL. But in actual it is the electrons that move under the effect of external electric field constituting current.

Since in our problem a positive charge is flowing from Cat's ears to our hand

Hence our hand MUST BE AT A LOWER VOLTAGE POTENTIAL THAN THE VOLTAGE POTENTIAL OF THE CAT.

HENCE OPTION A IS CORRECT.

PROBLEM 2

Since the branch containing I2 is grounded hence I2 will not flow . Consequencely the branch containing I1 will get short circuited and hence It will also stop flowing .

Hence correct option is D that is BOTH OF THEM ARE NOT FLOWING.

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