Current

Q. A 12 cm wire is given the shape of a right angled triangle ABC having sides AB= 3cm, BC= 4cm, CA= 5cm . The resistance between two sides i.e. AB, BC, CA are measured by a multimeter . Calculate the ratio of the resistances.

Q. What is electrical induction? Explain with examples.

Q. a charge q is placed at (1, 2, 1)and another charge -q is placed at (0, 1, 0) such that they form an electric dipole there exists a uniform electric field e=2i calculate the torue

Q.

If the electric consumption of your house is $20kWh$ in one day and the cost of electricity is $Rs4$ per unit, find out how much electricity bill you will have to pay for one month($30days$).

1. $Rs.1200$

2. $Rs.800$

3. $Rs.2400$

4. $Rs.3600$

Q.

Define 1 ohm, 1 volt, 1 ampere briefly?

Q.

Conduction current

Q.

"The rate of flow of current in an electric circuit is called electric charge."

1. False

2. True

Q. Electric field at point P (2, 3, 4) due to charge 1 nano coulomb which is placed at (1, 2, 3) is Ex component of electric field at point P is

Q.

Electric current is the flow of :

1. Electrons

2. Protons

3. Neutrons

4. None of these

Q.

Explain the construction of an electric bulb.

Q. How many faradays/coulombs are required to produce (i)20 g of calcium from molten CaCl2?(ii)40 g of aluminium from molten Al2O3?

Q.

What is the value of x if one coulomb is equal to x emu?

Q. Specific resistance of aluminum is 2.63*10 ohm cm. What is meant by this statement

Q. Two wires that are made up of two different materials, whose specific resistances are in the ratio 3:2, length 4:3 and area 5:4. What is the ratio of their resistances?

Q.

Which of the following require the use of electricity?

1. All of these

2. To wash clothes in washing machines

3. To operate pumps

4. For lighting

Q.

North Pole of a bar magnet

1. will attract the South Pole of another bar magnet

2. will repel the South Pole of a horse shoe magnet

3. will attract the North Pole of a horse shoe magnet

4. will attract a piece of wood

Q.

________ electricity is the electricity produced by friction.

Q.

The rate of flow of charge in an electric circuit is called electric

1. Potential

2. Power

3. Current

4. Resistance

Q. Question 4

When the electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates

(a) the chemical effect of current.
(b) the heating effect of current.
(c) the magnetic effect of current.
(d) the lightning effect of current.

Q. What is electicity?

Q.

What constitutes the current?

Q.

When an ebonite rod is rubbed with fur, the electrons move from the ebonite rod to fur.

1. True
2. False

Q.

Electricity is a phenomenon which has the capacity to store __.

1. Energy

2. Light

3. Matter

4. All of these

Q.

The SI unit of current is

1. Volt

2. Ohm

3. Ampere

4. Coulomb

Q.

Is Earth magnetic field weakening?

Q.

Name the property by which a freely suspended magnet points towards North-South direction.

Q.

Look at the diagram and answer the following question.

Which of the iron bars is not a magnet? Justify.

Q. A wire of resistance 12 ohm is bent to form a circle. What is its equivalent resistance across its diameter?

Q.

Si Unit Of Coulomb?

Q. A charge q is placed at the centre of a conducting hollow sphere.and an uniform electric field E is turned on.in second case the charge is placed at some point other than center in a conducting shell and in uniform electric field.in which case net force on charge q is 0?, force due to shell 0?force to electric field 0?