An ammeter and a voltmeter of resistance R are connected in series to an electric cell of negligible internal resistance. Their readings arc A and V, respectively. If another resistance R is connected in parallel with the voltmeter then

A
both A and V will increase
B
both A and V will decrease
C
A will decrease and V w1ll increase
D
A will increase and V will decrease

Solution:

After connecting a resistance R in parallel with the voltmeter, its effective resistance decreases. Hence, less voltage appears across it, i.e., V will decrease. Since overall resistance decreases, so more current will flow, i.e., A will increase.

Solution:

Related content