Is it possible for two lines of equipotential to cross each other? a) yes b) no

Question

Is it possible for two lines of equipotential to cross each other? a) yes b) no c) depends on polarity of the charges that generate the field d) not enough information given e) depends on magnitude of the changes that generate the field In the following figure the bar magnet moves on the dotted circle such that its north pole always points toward the center of the given loop. What is the direction of the induced current in the loop? a) There is no induction b) clockwise c) counterclockwise d) Depends on speed the magnet e) depend on change in the speed of the magnet What is the answer to 28, if the bar magnet moves towards the center of the loop? a) There is no induction b) clockwise c) counterclockwise d) Depends on speed of the magnet e) depend on change in the speed of the magnet What is the potential difference across the 6-Ohm resistor of the following figure? a) 8-V b) 2-V c) 5 V d) 4-V e) 1-V What is the potential difference across the 8-Ohm resistor of question 30? a) 1.6 V b) 3.2 V c) 4.8 V d) 64 V e) none of these Which resistor question 30 dissipates more power? a) 2-Ohm b) 6-Ohm C) 8-Ohm d) same for all e) there is no way to say What is the direction of induced current in the loop of the following figure if the current in the given wire decreases with time? a) counter clockwise b) clockwise c) 0 d) depends on the magnitude of the current e) Cannot tell because the radius is not given What would be the answer to question (33), if the wire were perpendicular to the plane of the loop? a) Counter clockwise b) clockwise c) 0 d) depends on the magnitude of the current e) Cannot tell because the radii are not given

Explanation / Answer

30. Answer is 8V. Because the 6 ohm resistor is connected such that its ends are connected to the ends of the battery.

31. Answer is 8*8/10 = 6.4 V. Because when two resistors are connected in series to the battery, the potential difference across them is proportional to their respective resistance .

32. Answer is 2 ohm resistor. Power = (V^2)/R

33. According to the Lenz's Law. The current induced in a loop opposes the cause of its production, here the cause is the decreasing magnetic flux in the upwards(out of the plane of paper) direction . So, the induced current will be such that it increases the flux in upwards direction. Hence, counter-clockwise current.

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