NEET 2020 Revision: Current Electricity - 4

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Question 1

The charge(q) (in C) flowing through a cross-sectional area is given as a function of time(t) (in sec):
q(t)=(6t²+3t+4) A
What is the instantaneous current through the cross-section at t=1 sec?

• A11 A
• B13 A
• C15 A
• D17 A

Question 2

If each resistor shown in the figure has resistance 20 Ω and the e.m.f of battery is 10 V, then, the current flowing through the battery is?

• A1 A
• B2 A
• C0.5 A
• D0.25 A

Question 3

If voltage across a bulb rated 220 V-100 W drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is

• A20%
• B2.5%
• C5%
• D10%

Question 4

An inductor (L = 20 H), a resistor (R = 100) and a battery (E = 10 V) are connected in series. After a long time, the circuit is short-circuited and then the battery is disconnected. Find the current in the circuit at 1 ms after short circuiting.

• A4.5 x 10⁶ A
• B3.2 x 10^-5 A
• C9.8 x 10^-6 A
• D6.7 x 10^-4 A

Question 5

6Ω and 12Ω resistors are connected in parallel. This combination is connected in series with a 10 V battery and 6Ω resistor. What is the potential difference between the terminals of the 12Ω resistor?

• A4 V
• B16 V
• C2
• D8 V

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