GAT Test - 8...

When a bar magnet is cut into two equal halves perpendicular to its length, the pole strength of each piece

Two current carrying long wires are placed parallel to each other and separated by a distance d. If the force on the segment of the wires is F, then the force F is related to d as:

An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true?

Consider the following statements :

A. Fleming’s left hand rule is used to determine the direction of force on a current-carrying conductor placed in a magnetic field

B. The right-hand thumb rule determines the direction of magnetic field due to a straight current carrying conductor

C. In our country the direction of alternative current changes after every 0·02 second

D. Advantage of DC over AC is that the electric power can be transmitted to distant places without appreciable loss of energy

The correct statements are

A circular current carrying loop is placed in a uniform magnetic field of magnitude B. The angle between the plane perpendicular to the coil and the magnetic field is θ. The current in the loop is I. Then the torque on the circular loop will be-

If a ferromagnetic material is inserted in a current carrying solenoid, the magnetic field of solenoid :

Which of the following statements is correct?

1. Magnetic line of forces always start from north pole and end at south pole of the magnet.

2. The magnetic lines of forces never intersect each other

Choose the correct code:

In the following circuit, find the value of I₂.

Given below are two statements labelled as Assertion (A) and Reason (R)

Assertion (A): On Increasing the current sensitivity of a galvanometer by increasing the number of turns, may not necessarily increase its voltage sensitivity.

Reason (R): The resistance of the coil of the galvanometer increases on increasing the number of turns.

Select the most appropriate answer from the options given below:

Assuming that the change in temperature of a conductor is negligible during a change in current flowing through it, if the current flowing through the conductor is increased accidentally by 100%, the increase in the power dissipated in the conductor would be