A long conducting circular rod is inside a long conducting square enclosure. The

Question

A long conducting circular rod is inside a long conducting square enclosure. The rod is maintained at a potential of -5000 volts with respect to the square which is grounded (V = 0). The contour lines are equipotentials with V = -4000, -3000, -2000, and -1000 volts. Select a response for each statement below. (Use 'N', North, towards top of page (+y dir), and E, East, to the right (+x dir), NE for in between 'N' and 'E', etc.) The y-component of the E-field at 8 is zero. The magnitude of the E-field at 8 is greater than that at 9 The x-component of the E-field at 9 is positive. The direction of the E-field at 6 is... The direction of the force on a small (-) charge at 1 is... The magnitude of the E-field at 5 is very small (approximately zero). The direction of the force on a small (+) charge at 8 is...

Explanation / Answer

the incorrect options selected are

x component of E field at 9 is positive is TRUE

the direction E field at 6 is NE because electric field goes from higher potential(here zero) towards lower potential(here - 5000 V)

the direction of force on small - charge at 1 is N because charge is negative so directio would be opposite to E

magnitude of E field at 5 is very small is FALSE. it is zero inside the conductor. as point 5 is not that clear, and if system says wrong then try with TRUE option to it.

the direction of force on small + charge at 8 is W

other options are done rightly

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