1i think ammeter but not so much sure i have a doubt wid milliammeter
Q1)In the circuit shown in figure switch S is closed at time t=0.Let i1 and i2 be the currents at any finite time t ,then the ratio i1/i2
a. is constant
b.increases with time
c. decreases with time
d.first increases and then decreases
please give an explanation
Q2)which of the following has the maximum resistance ?
a. voltmeter
b.milivoltmeter
c.ammeter
d.miliammeter
i know the answer but am not able to give a satisfactory explanation ...
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10 Answers
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1the answer given is millivoltmeter
actually i had thought that a millivoltmeter is more accurate and so it must be having maximum resistance .....as we say that an ideal voltmeter is the one with ∞ resistance ...... as millivoltmeter is more accurate ,.it is closer to an ideal one and so it must have higher resistance than a voltmeter....
as for ammeter and milliammeter ideal ammeter will have zero resistance .....
.so clearly milliammeter will have the lowest resistance as compared to all four but this is not so nice solution ...can i have some clear solution ...like with formulas ,,,,,or so ,,,
1for the first ..... the answer given is b ......i have no clue to solve it .....actually sir told us that two capacitors in an RC circuit is not in course ,,...but this question is solvable .......i don't know how
1i solved it taking differential and all ...but there appears a differential equation which I am not able to solve
1i will never be askec........bcz ths q needs time...
but if u want to solve,...thn '
1 find current in terms of i1 and i2...
it would in V/R e-t/3rc and v/r e-t/rc form....
simply take its ratio....u;ll get ur ans..
1how did you get 3rc...it should be 2rc
please see the question once again
1well ..........i;ll hv to check agn ...\
by d u knw how to approach such question....