Electrostatic Potential and Capacitance Test

Result

Electrostatic Potential and Capacitance Test - 66

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Weekly Quiz Competition

Question 1
1 / -0

If the area of one of the plates of a parallel plate capacitor is half that of the other, then charges on its plates are:

A
$$+Q$$ and $$Q$$

B
$$+Q$$ and $$+Q$$

C
$$4Q$$ and $$Q/2$$

D
$$+ Q/2$$ and $$Q$$
Question 2
1 / -0

Find equivalent capacitance between A and B.

A
$$ \frac {2A\varepsilon _o}{3d} $$

B
$$ \frac {3A\varepsilon _o}{2d} $$

C
$$ \frac {A\varepsilon _o}{3d} $$

D
$$ \frac {4A\varepsilon _o}{3d} $$
Question 3
1 / -0

An external agent pulls a unit positive charge from infinity to a point, then the potential of that point is

A
Positive

B
Negative

C
May be positive or may be negative

D
Zero

Solution

Amount of work done on a unit positive charge in an electric field from bringing it from infinity to certain point is called electric potential and in it the positive amount of the work is obtained. Potential at infinity is assumed to be zero.
Question 4
1 / -0

A semicircular wire of radius $$a$$ having $$\lambda$$ as charge per unit length is shown in the figure. The electric potential at the centre of the semicircular wire is

A
$$\lambda/\epsilon_{0}$$

B
$$\lambda/4\pi \epsilon_{0}R$$

C
$$\lambda/4\epsilon_{0}$$

D
None of these

Solution
Question 5
1 / -0

Two $$30\mu F$$ capacitors are joined in parallel. This combination is then joined in series with series combination of two $$30\mu F$$ capacitors. The effective capacitance will be?

A
$$12\mu F$$

B
$$45\mu F$$

C
$$12\mu F$$

D
$$30\mu F$$

Solution
Question 6
1 / -0

The equivalent capacity of the combination shown in figure is?

A
C

B
$$2C$$

C
$$3/2C$$

D
$$C/2$$

Solution
Question 7
1 / -0

Two identical drops of a liquid are charged to the same potential of $$100$$V. They are then merged into one large drop, the potential of the large drop is?

A
$$172$$ V

B
$$193$$ V

C
$$159$$ V

D
$$100$$ V

Solution
Question 8
1 / -0

For circuit shown equivalent capacitance between S and Q is?

A
$$C$$

B
$$C/2$$

C
$$2C$$

D
$$3C/2$$

Solution
Question 9
1 / -0

When a bird sits on a very high voltage cable.

A
Its feathers ten to spead

B
Its feathers tend to compress

C
It receives an electric shock

D
Neither its feathers have any effect nor electric shock is received by it

Solution
Question 10
1 / -0

The equivalent capacitance between points M and N is?

A
$$\dfrac{10}{11}C_0$$

B
$$2C_0$$

C
$$C_0$$

D
None of these

Solution