Section 14.4 Electric Field
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Section 14.4 Electric field • Electric field line
© Manhattan Press (H.K.) Ltd.
1
14.4 Electric field (SB p. 19)
Electric field What causes like charges to repel and unlike charges to attract? Charged objects exert electrostatic force (attractive / repulsive) on nearby objects
+ + +
-
+ +
-
+
-
+ +
Thinking 6 © Manhattan Press (H.K.) Ltd.
2
14.4 Electric field (SB p. 19)
Electric field charged objects sets up an electric field around it
Electric field patterns — shows E-field due to charged object
© Manhattan Press (H.K.) Ltd.
3
14.4 Electric field (SB p. 19)
Electric field E.H.T. power supply Expt 14A Electric field
Electric field apparatus →semolina lines up →electric field pattern
− electrode
point electrode © Manhattan Press (H.K.) Ltd.
+ electrode
semolina
castor oil 4
14.4 Electric field (SB p. 20)
Electric field Electric field patterns formed by electrodes of different shapes
−
+
(a) © Manhattan Press (H.K.) Ltd.
−
+
(b) 5
14.4 Electric field (SB p. 20)
Electric field
−
+
+ − +
(c)
−
(d)
© Manhattan Press (H.K.) Ltd.
(e)
6
14.4 Electric field (SB p. 20)
Electric field line E-field pattern represented by ⇒ electric field lines
s e n i l d l e i f r close → stronger force © Manhattan Press (H.K.) Ltd.
shows the directions o f forces experienced by a positive tes t charge (X) in E-fiel d
7
14.4 Electric field (SB p. 20)
Electric field line directed from +ve char ge to −ve char ge
+
© Manhattan Press (H.K.) Ltd.
–
8
14.4 Electric field (SB p. 21)
Electric field line Do not have branches
+
× © Manhattan Press (H.K.) Ltd.
Do not cross one another
×
–
9
14.4 Electric field (SB p. 21)
Class Practice 4: 4 Refer to Fig. 14.14, sketch the electric field lines between the electrodes in the electric field apparatus as shown. (a)
(b)
(c)
(d)
Ans wer © Manhattan Press (H.K.) Ltd.
10
To section 14.5
© Manhattan Press (H.K.) Ltd.
11
14.4 Electric field (SB p. 19)
Thinking 6
Name one similarity between an electric field and a gravitational field. Both exert a force on an object.
Ans wer
Return to
Text
© Manhattan Press (H.K.) Ltd.
12
© Manhattan Press (H.K.) Ltd.
1
14.4 Electric field (SB p. 19)
Electric field What causes like charges to repel and unlike charges to attract? Charged objects exert electrostatic force (attractive / repulsive) on nearby objects
+ + +
-
+ +
-
+
-
+ +
Thinking 6 © Manhattan Press (H.K.) Ltd.
2
14.4 Electric field (SB p. 19)
Electric field charged objects sets up an electric field around it
Electric field patterns — shows E-field due to charged object
© Manhattan Press (H.K.) Ltd.
3
14.4 Electric field (SB p. 19)
Electric field E.H.T. power supply Expt 14A Electric field
Electric field apparatus →semolina lines up →electric field pattern
− electrode
point electrode © Manhattan Press (H.K.) Ltd.
+ electrode
semolina
castor oil 4
14.4 Electric field (SB p. 20)
Electric field Electric field patterns formed by electrodes of different shapes
−
+
(a) © Manhattan Press (H.K.) Ltd.
−
+
(b) 5
14.4 Electric field (SB p. 20)
Electric field
−
+
+ − +
(c)
−
(d)
© Manhattan Press (H.K.) Ltd.
(e)
6
14.4 Electric field (SB p. 20)
Electric field line E-field pattern represented by ⇒ electric field lines
s e n i l d l e i f r close → stronger force © Manhattan Press (H.K.) Ltd.
shows the directions o f forces experienced by a positive tes t charge (X) in E-fiel d
7
14.4 Electric field (SB p. 20)
Electric field line directed from +ve char ge to −ve char ge
+
© Manhattan Press (H.K.) Ltd.
–
8
14.4 Electric field (SB p. 21)
Electric field line Do not have branches
+
× © Manhattan Press (H.K.) Ltd.
Do not cross one another
×
–
9
14.4 Electric field (SB p. 21)
Class Practice 4: 4 Refer to Fig. 14.14, sketch the electric field lines between the electrodes in the electric field apparatus as shown. (a)
(b)
(c)
(d)
Ans wer © Manhattan Press (H.K.) Ltd.
10
To section 14.5
© Manhattan Press (H.K.) Ltd.
11
14.4 Electric field (SB p. 19)
Thinking 6
Name one similarity between an electric field and a gravitational field. Both exert a force on an object.
Ans wer
Return to
Text
© Manhattan Press (H.K.) Ltd.
12
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