Two identical bulbs are connected in parallel across an ideal source of emf $E$. The ammeter $A$ and voltmeter $V$ are ideal. If bulb $B_2$ gets fused, then
AReading of $A$ will increase but that of $V$ will remain same
BReading of $A$ will decrease but that of $V$ will increase
CReading of $A$ will decrease but that of $V$ will remain same
DReading of $A$ will increase and reading of $V$ will also increase
Medium
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CReading of $A$ will decrease but that of $V$ will remain same
c (c)
If $B_2$ gets fused, $R_{\text {net }}$ increases, $i$ decreases, but reading of $V$ remains same.
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Refer to the circuit shown. What will be the total power dissipation in the circuit if $P$ is the power dissipated in $R_1$ ? It is given that $R_2=4 R_1$ and $R_3=12 R_1$ are .......... $P$
Two wires of the same material are given. The first wire is twice as long as the second and has twice the diameter of the second. The resistance of the first will be
There is a current of $1.344\, amp$ in a copper wire whose area of cross-section normal to the length of the wire is $1\,m{m^2}$. If the number of free electrons per $c{m^3}$ is $8.4 \times {10^{22}}$, then the drift velocity would be