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Byju's Answer

Standard XII

Physics

Electric Potential at a Point in Space Due to a Point Charge Q

If a point on...

Question

If a point on a circuit is earthed, it means potential of this point has become zero. In the circuit shown in figure switch S can be shifted to position A or position B. Current through resistance is say $i_{1}$ when switch is in position A and $i_{2}$ when switch is in position B, then

i_{1}

= 2.5A

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i_{2}

= 0

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both A and B are correct

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both A and B are wrong

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Solution

The correct option is B $i_{1}$ = 2.5A
When switch is connected to A.
$\Rightarrow - 10 + i_{1} 4 + 20 = 0$
$\Rightarrow$ $i_{1} = 2.5 A$ in reverse direction of that we assumed
when switch is connected to B
$\Rightarrow - 20 + 4 i_{2} = 0$
$\Rightarrow i_{2} = 5 A$ .

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Similar questions

In the circuit shown figure switch S can be shifted to position A or Position B. Current through resistance is say i₁ when switch is in position A and i₂ when switch is in position B, then

Q. In the given figure assume that the switch was in position 1 for a long time and thrown to position 2 at

t = 0

I_{1} (s)

and

I_{2} (s)

are the Laplace transform of

i_{1} (t)

and

i_{2} (t)

respectively. The equation for the loop currents

I_{1} (s)

and

I_{2} (s)

for the circuit after switch is brought form position 1 to position 2 at

t = 0

I_{1} (s)

and

I_{2} (s)

are the Laplace transforms of

i_{1} (t)

and

i_{2} (t)

respectively. The equations for the loop currents

I_{1} (s)

and

I_{2} (s)

for the circuit shown in the figure, after the switch is brought from position 1 to position 2 at t = 0, are

Q. In the circuit shown in figure initially the switch is in position 1 for a long time then suddenly at

t = 0

, the switch is shifted to position 2. It is required that a constant current should flow in the circuit, the value of resistance

R

in the circuit

Q. A charged capacitor

C_{1}

is discharged through a resistance R by putting switch

S

in position

1

of circuit shown in figure. When discharge current reduces to

1_{o}

, The switch is suddenly shifted to position

2

. Calculate the amount of heat liberated in resistance

R

starting from this instant. Also, calculate current

i

through the circuit as a function of time.

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If a point on a circuit is earthed, it means potential of this point has become zero. In the circuit shown in figure switch S can be shifted to position A or position B. Current through resistance is say i1 when switch is in position A and i2 when switch is in position B, then

The correct option is B i1= 2.5AWhen switch is connected to A.⇒−10+i14+20=0⇒ i1=2.5A in reverse direction of that we assumedwhen switch is connected to B⇒−20+4i2=0⇒i2=5A.

If a point on a circuit is earthed, it means potential of this point has become zero. In the circuit shown in figure switch S can be shifted to position A or position B. Current through resistance is say $i_{1}$ when switch is in position A and $i_{2}$ when switch is in position B, then

The correct option is B $i_{1}$ = 2.5A
When switch is connected to A.
$\Rightarrow - 10 + i_{1} 4 + 20 = 0$
$\Rightarrow$ $i_{1} = 2.5 A$ in reverse direction of that we assumed
when switch is connected to B
$\Rightarrow - 20 + 4 i_{2} = 0$
$\Rightarrow i_{2} = 5 A$ .