First slide

Electric field

Question

The electric field at 20 cm from the centre of a uniformly charged sphere of radius IO cm is E. Then at a distance 5 cm from the centre it will be :

Easy

A

16E
B

4E
C

2E
D

Zero

Solution

$E_{outside} = \frac{KQ}{{(20)}^{2}} = E; E_{outside} = \frac{KQ (5)}{{(10)}^{3}} = 2 E$

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