21.n a circuit a metallic wire is connected in series with a battery and an ammeter.if another wire(same metal,same length and cross sectional area )is connected in parallel to the metallic wire , the current in ammeter will be: A)halved B) doubled C)four times D) same

Open in App

Solution

Suggest Corrections

Similar questions

Q. A battery with EMF of

9 V

is connected in series with an ammeter and a voltmeter. Resistance of these devices are unknown. If the voltmeter is connected to a resistance

(

its value is also unknown

)

in parallel, the ammeter reading will be doubled, and the voltmeter reading halved. What will be the voltmeter reading (in

V

) after connecting the resistance ?

Q. A conducting wire of length

l

, area of cross-section

A

and electrical resistivity

ρ

is connected between the terminals of a battery. A potential difference

V

is developed between its ends, causing an electric current. If the length of the wire is doubled and the area of cross-section is halved, the resultant current would be:

Q. Two metallic wire of same material and same length have different diameters when connected in series across a battery, the heat produced in thinner wire is

Q_{1}

and that in thicker one is

Q_{2}

. the correct relation is

Q. There are two metallic wires of same material, same length but of different radii. When these are connected to an ideal battery in series, heat produced is

H_{1}

but when connected in parallel, heat produced is

H_{2}

for the same time. Then the correct statement is

When a battery is connected to a P-type semiconductor with a metallic wire, the current in the semiconductor (predominantly), inside the metallic wire and that inside the battery respectively due to

Join BYJU'S Learning Program