1No one interested in the first ques ????
Ques1)
The figure shows a meter brdge circuit, with AB = 100 cm, X =12 cm and R =18 ohms, and the jockey is in the posn of balance.If R is now 8 ohm, through what distance will J have to be moved to obtain balance.
(a)10 cm
(b)20 cm
(c)30 cm
(d)40 cm
Ques2) 
A source of emf E = 10V and having negligible internal resistance is connected to a variable resistance. The resistance varies as shown in the figure.Show that the total charge that has passed through the resistor R during the time interval from t1 to t2 is 10 ln 2.
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2 Answers
112)
I JOINED TERRORISM, BUT THEY SAID ITS TOO TOUGH FOR THEM! Don't take this seriously.....[78]
Observe in the given time-interval, Resistance varies as R=T i=\frac{dq}{dt}\\ \ \frac {V}{R}=i=\frac{dq}{dt}\\ \implies \int_{20}^{40}{\frac{dt}{t}}=\frac{1}{V}\Delta q
now hopefully it can be done.....
Pls correct if I'm wrong.