s- sketch the field pattern and the equ Potential lines of two negatively charge

Question

s- sketch the field pattern and the equ Potential lines of two negatively charged small spheres hort distance from each ot 2- What is the battery current (Baer) when the switch in the Figure below is open and closed? (a) A (ii) 9.14 A (b) (i) 9 A, (ii) 8 A (c) (i) 2.14 A (ii) 8 A (d) (i) 8 A (i) 2 A 3- Resistivity of a wire depends on (a) Length Material c) Cross section area (d) None of the above 4- In a parallel circuit, as light bulbs are added, the voltage at the battery increase/decrease/ remains the same and the current at the battery increase/ decrease remain the same. 5- Resistance of a wire is "R" ohms. The wire is stretched to double its length, then its resistance in ohms is? (Note: when the wire is stretched to double, its cross section area also changes) (a) R/2 (b) 4R (c) 2R (d) R/4

Explanation / Answer

2)

When switch is open ,equivalent resistance

R=(3+3)*(5+1)/(3+3+5+1)=3 ohms

Total current

I=V/R=24/3 =8 A

When switch is closed

R=3*5/(3+5)+3*1/(3+1)=2.625 ohms

Total current

I=V/R=24/2.625=9.14 A

so answer is A

3)

Material

4)

Remains the same & Decreases

5)

Resistance

R=pL/A

=>R1/R2=L1/L2 =L/2L

R2=2R1

answer is C

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