Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 119

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Two metal wired having conductivities $σ_{1}$ and $σ_{2}$ , respectively have same dimensions. If they are connected in series the effective conductivity of the combination is

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Important Questions on Current Electricity

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 120

If in the circuit, power dissipation is $150 W$ then $R$ is

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 121

A $3$ volt battery with negligible internal resistance is connected in a circuit as shown in the figure. Current $i$ will be

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 122

The total current supplied to the circuit by the battery is

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 124

An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of

\frac{4}{3}

and

\frac{2}{3},

then the ratio of the current passing through the wires will be:

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 125

The current $I$ drawn from the $5$ volt source will be

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 126

In a Wheatstone bridge, resistances

P, Q

and

R

are connected in the three arms and the fourth arm is formed by two resistances

S_{1}

and

S_{2}

connected in parallel. The condition for the bridge to be balanced will be

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 127

For a cell the terminal potential difference is

2.2 V

when circuit is open and reduces to

1.8 V

when cell is connected to a resistance

R = 5 Ω,

the internal resistance

(r)

of cell is:

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 129

Resistances

n

, each of

r

ohms, when connected in parallel give an equivalent resistance of

R

ohms. If these resistances were connected in series, the combination would have resistance in ohms, equal to: