Question

Charge one of +4 C is located at (2,0,0). Charge two of -5 C is located at (0,2,0). What is the potential at a point P, with coordinates (3,4,2)?

6.572 kV

3.022 kV

9.594 kV

4.194 kV

Determine the resultant force on a 3 C charge due to -4 C charges. All these three point charges are placed on the vertices of equilateral triangle of side 50 cm.

1.08 N

0.941 N

0.432 N

0.623 N

3.A group of dc motors is to operate at 220 volts at a place that is 400 ft away from 230-volt mains. What diameter (minimum) of copper wire is to be used in connecting the motors to the main, if the motors take a total of 75 A?

0.25 in

0.33 in

0.18 in

0.45 in

4.What bleeder resistor is required to complete a voltage divider to give 300 V at 40 mA from a 500-V source of emf if the series dropping resistor is 4000 ohms?

25 k

30 k

20 k

35 k

5.If 5 joules of work are done in moving 0.025 coulomb of positive charge from point A to point A’. What is the difference in potential of the points A and A’?

200 V

8000 V

0.125 V

5 mV

6.A 1500 W heating element at an initial temperature of 15°C is connected to a supply voltage of 115 V. After the temperature of the element has been stabilized (steady-state conditions), it is found that a voltage of 125 volts is required to maintain rated output. If the temperature coefficient of the element is 0.0006 per °C, determine the element’s final temperature.

300°C

285°C

290°C

317°C

Answer 1

The solution of Question no. 1 is-In this problem distance unit was not mentioned.