A small 0.050-kg insulating sphere carries a charge of -60 pC and is hanging by

Question

A small 0.050-kg insulating sphere carries a charge of -60 pC and is hanging by a vertical silk thread from a fixed point in the ceiling An external unitorm vertical applied. If the applied electric field has a magnitude of 3000 N/C and is drected downward electric field is now , what is the tersion in the slk tread (1-10° N m2c2) 0.19 N 0.31 N 0.41 N 0.52 N 71 N A 50- point charge is placed at th© O cm mark of a meter sticx and a 0- Ccharge spaced at he 50 cnmark. Nhat sit het ci cid te som mann -ar. 40 105 NIC 5.0 105 NC 90 105 NC 1.4× 106 NC

Explanation / Answer

Here

m = 0.050 Kg

q = - 60 uC

electric force , F = q * E

F = 60 *10^-6 * 3000 N

F = 0.18 N

as the charge is negative , electric force is upwards

Now, for the tension in the silk thread

Tension + 0.18 = 0.050 * 9.8

Tension = 0.31 N

the tension in the wire is 0.31 N

=============================================

net electric field = electric field due to 5 uC + electric field due to -4 uC

net electric field = 9 *10^9 * 10^-6 * (5/0.30^2 + 4/.20^2)

net electric field = 1.4 *10^6 N/C

the net electric field is D) 1.4 *10^6 N/C

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