Dr. Dr. Shawn Teah Scientific Knowledge of Acadamia

Dr. Dr. Shawn Teah Scientific Knowledge of Acadamia This page is to enhance the knowledge of science in simple way so that one who seeks to understand m

08/03/2021

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23/08/2020

sample problems on Electric field;
1 find the electric field, if a charge of 2nc attracts another charge with the same magnitude when it is put in the field at a distance of 2cm.
Soln, data
d=2cm×1m/100cm=0.02m
q'=2nc×(10^-9C/nc)=2×10^-9C
q=q'=2×10^-9C
E=?
K=9×10^9Nm²/C²
Formulas;
E=F(on q)/q' or E=kq/(d² or r²)
We can use the second formula
E=kq/r²,
E=(9×10^9nm²/c²)(2x10^-9C)/(2×10^-2m)²
E=(18Nm²/c)/(4x10^-4m²)
E=45,000N/C
E=45,000E

23/08/2020

# Topic electric field (mathematical)
in terms of test charge(q');
E=F(on q)/q' unit=N/C or E
such that E= electric field(unit-N/C), F=force(unt-N), q=source charge(unit-C) & q'=test charge(unit-C)
But note that the force=kqq'/r²
K=electrostatic constant (9×10^9Nm²/C²), r=the distance between the charges(unit-m).
in terms of the source charge (q); If E=F/q' & F=kqq'/r², then if we substitute F as kqq'/r² in E=F/q'
We will have;
E=(F=kqq'/r²)/q'=(kqq'/r²/q')
E=(kqq'/r²)÷(q')---(kqq'/r²)×(1/q'), such that q' will cancel q' algebraically, then we will now have
(E=kq/r²), [away from q if q>0]
[ towards q ifq

23/08/2020

Topic electric field(literature)
Definition; is the region around a charge where the force is experienced.
def; is the way of conceptualizing and mapping the force experienced by an object that is distance apart from another object without apparent physical connection.
points about electric field;
1 a group of charges called the source charge alter space around them by creating the field.
2 the test or probe charge experienced a force exerted by the field.
3 if the test charge is positive the field goes in the direction of the force but negative test charge, the field goes in opposite direction of the force.
4 The field is dependent of the source charge which create them and independent of the test charge which probes the field.
5 there is a vector exist in every point space in the field.
6Also note that the field goes away from a positive charge and goes towards a negative charge.
FIELD LINES;
def; the field lines are symbols used to visualize and analyze electric fields.
points about electric field lines
1 field lines must begin on a positive charge and terminate on a negative charge.
2 the numbers of field lines leaving a positive charge or entering a negative charge is directly proportional to the magnitude of the charges
3 the strength of the field is directly proportional to the closeness of the lines or more precisely to the number of lines perpendicular to the lines.
4 the direction of the field is tangent to the field line at any point in space.
5 field lines can never cross.

24/07/2018

Albert Einstein is the greatest revolutionary scientist of all times

24/06/2018

Happy Sunday famz. Pray that you shall be blessed this day.

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