# 2 physics questions

1)Two point charges, 3.0 ÂµC and -2.0 ÂµC, are placed 4.8 cm apart on the *x* axis, such that the -2.0 ÂµC charge is at *x* = 0 and the 3.0 ÂµC charge is at *x* = 4.8 cm.

(a) At what point(s) along the *x* axis is the electric field zero? (If there is no point where *E* = 0 in a region, enter “0” in that box.)

x < 0 |
cm |

0 < x < 4.8 cm |
cm |

4.8 cm < x |
cm |

(b) At what point(s) along the

*x* axis is the potential zero? Let

*V* = 0 at

*r* = âˆž. (If there is no point where

*V* = 0 in a region, enter “0” in that box.)

x < 0 |
cm |

0 < x < 4.8 cm |
cm |

4.8 cm < x |
cm |

2)A +5.5 ÂµC charge is 19 cm to the right of a -7.1 ÂµC charge.(a) At the midpoint between the two charges, what is the potential?

V

(b) At the midpoint between the two charges, what is the electric field?

V/m