Electric Current(I)

Q. A Square surface of side L meter in the plane of paper is placed in a uniform electric field E (volt/m) acting along the same plane at an angle theta with the horizontal side of square as shown in figure. The electric flux linked to the surface; in units of volt /m is

Q.

Define Direct current and give some examples of it.

Q.

Define Alternating Current and give some examples of it.

Q.

The time rate of flow of electric charge is the measure of electric___.

Q.

Q. In an open circuit, the electric current flows from the terminals:

1. Cannot say
2. No flow
3. (-) to (+)
4. (+) to (-)

Q.

If $2A$ of current flows through a conductor, the charge that flows in one minute is……..$C$.

1. $12$

2. $120$

3. $60$

4. $16$

Q. Question 5
At the time of short circuit, the current in the circuit
(a) reduces substantially
(b) does not change
(c) increases heavily
(d) vary continuously

Q. Charge on an electron is $1.6\times {10}^{-19}$ coulomb. Number of electrons passing through the wire per second on flowing of 1 ampere current through the wire will be

1. $0.625\times {10}^{-19}$
2. $1.6\times {10}^{19}$
3. $1.6\times {10}^{-19}$
4. $0.625\times {10}^{19}$

Q. In a closed circuit, the electric current flows from the terminals:

1. Cannot say
2. (-) to (+)
3. Doesn't flow
4. (+) to (-)

Q. A body is brought near a negatively charged gold leaf electroscope. If the divergence of leaves remains unchanged, state the kind of charge on body in this case.

1. positive
2. Negative
3. no charge
4. cant say

Q. In the circuit shown in the figure, the heat produced it is the 5 $\Omega$ resistor due to the current flowing through it is 10 calories per second. The heat generated in the 4 $\Omega$ resistor is

1. 1 calories/sec
2. 2 calories/sec
3. 3 calories/sec
4. 4 calories/sec

Q. SI unit of electric current is

1. Newton
2. Joule
3. Metre
4. Ampere

Q. e²/4π€=[F*d²] how??

Q.

Ram has an LED of resistance 10$\Omega$ which will only light up if the current provided is 1A. Below 1A current it won't light up, above that the LED will burst. He also has 10 two volt cells. Find out how many cells will Ram need to light up the LED?

1. 2

2. 10

3. 5

4. 1

Q. What is the colour of neutral wire in new convention?

1. Black
2. Red
3. Brown
4. Blue

Q.

Coulomb/sec is also equal to:

1. joule

2. ampere

3. volt

4. tesla

Q. The dimension of time in Electric field intensity is :

1. $-1$
2. $-3$
3. $3$
4. $-2$

Q. A 50 V d.c power supply is used to charge a battery of eight lead accumulators, each of emf 2 V and internal resistance $1/8\Omega$. The charging current also runs a motor connected in series with the battery. The resistance of the motor is $5\Omega$ and the steady current supply is 4 A. The total power lost due to heat dissipation is

1. 64 W
2. 80 W
3. 96 W
4. 90 W

Q.

$1\mu A$ = ___________ A

Q.

One coulomb charge per second equals to ___ ampere.