Electric Charge and Field | Physics JEE previous year questions with Solutions

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Topic Question Set

Q 1 :
The vehicles carrying inflammable fluids usually have metallic chains touching the ground [2024]

to alert other vehicles
it is a custom
to conduct excess charge due to air friction to ground and prevent sparking
to protect tyres from catching dirt from ground

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(C) Due to friction, fluids get charged, this can result in combustion.

So, metallic chains is used to discharge excess charge.

Q 2 :
Force between two point charges $q_{1}$ and $q_{2}$ placed in vacuum at $' r'$ cm apart is F. Force between them when placed in a medium having dielectric $K = 5$ at $r / 5$ cm apart will be: [2024]

F/25
5F
F/5
25F

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(B) In air $F = \frac{1}{4 π \in_{0}} \frac{q_{1} q_{2}}{r^{2}}$

In medium

$F' = \frac{1}{4 π (K \in_{0})} \frac{q_{1} q_{2}}{{(r')}^{2}} = \frac{25}{4 π (5 \in_{0})} \frac{q_{1} q_{2}}{{(r)}^{2}} = 5 F$

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