Magnetic FIeld Due to Circular Current Carrying Loop

Q.

The magnetic field line passing through the center of a circular current carrying coil is a straight line.

1. True

2. False

Q.

What are the factors on which the strength of an induced current depends?

Q. What is the shape of the magnetic field lines at the centre of the current carrying coil?

1. Elliptical
2. Straight line
3. Circular
4. Magnetic field is zero at the centre.

Q.

What causes the inductance?

Q.

A current carrying conductor placed in magnetic field experiences a force. The amount of force experienced by a current carrying conductor in a magnetic field can be increased by:

1. Decreasing the magnetic field.

2. Increase the current in the conductor.

3. Increasing the magnetic field.

4. Decrease the current in the conductor.

Q. In the figure shown below, current is flowing in the clockwise direction in a loop of wire. The part of the loop that faces you has ___ pole.

1. east
2. west
3. north
4. south

Q.

A cylindrical bar magnet is placed at a fixed point along the axis of a circular coil as shown in the figure below. If the magnet is rotated about the axis of the coil, then:

1. A current will be induced in the coil

2. Only emf will be induced in the coil

3. Emf and current both will be induced in the coil

4. No current will be induced in the coil

Q. what is the difference between the direction of magnetic field and the direction of magnetic field lines

Q. When two bar magnets were brought close to each other, they repelled. What are the poles of the magnets in the figure?

1. 1 - North, 2 - South
2. One of them is non-magnetic
3. 1 - South, 2 - North
4. 1 - North, 2 - North

Q.

If a bar magnet is brought closer to another bar magnet's head. It was observed that they repel each other. Which of the following can be true?

1. 1- South, 2 - North

2. 1 - North, 2- North

3. None of these

4. 1 - North, 2- South

Q.

An electric current is induced in a circuit when:

1. a magnet is brought close to a wire.

2. a magnet is kept close to a wire.

3. a magnet is taken away from a wire.

4. a magnet is kept far from a wire.

Q. In the figure shown below, current is flowing in the anticlockwise direction in a loop of wire. The part of the loop that faces towards you is ___ pole.

1. east
2. west
3. north
4. south

Q. A current flows downwards in a wire that passes vertically through a table top. Will the magnetic field lines around it go clockwise or anticlockwise when viewed from above the table?

Q.

How do you measure the relative strength of magnetic fields generated by two current carrying coil?

1. Calculate the density of iron filings at the edges

2. Calculate the size of the magnetic field produced

3. Use a multimeter to calculate the current flowing through the coil

4. Use a voltmeter to find the current flowing through the coil

Q.

Look at the figure given below and answer the question based on it.

Iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. The other components of the circuit have their usual meanings

The deflection of the compass needle decreases as the compass is moved away from the copper wire. This tells that:

1. The magnetic field strength increases as the distance from the wire increases.

2. The magnetic field strength decreases as the distance from the wire increases.

3. There is no change in the magnetic field strength.

4. The magnetic field alters its direction as the distance from the wire increases.

Q. Which part of the current carrying circular loop represents the strongest magnetic field?

1. Centre of the loop.
2. A point close to the centre of the loop.
3. A point on the circumference of the loop.
4. A point outside the loop.

Q.

A rectangular coil ABCD of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each :

1. Two revolutions

2. One revolution

3. Half revolution

4. One-fourth revolution