Magnetic Effects of Current

What is the shape of the magnetic field lines around a straight current-carrying conductor?

Which rule helps to determine the direction of magnetic field around a current-carrying conductor?

What happens to the magnetic field strength if the current in a wire is doubled?

Which of the following devices works on the principle of magnetic effect of current?

According to Fleming's left-hand rule, what does the middle finger represent?

If a current-carrying coil is placed in a uniform magnetic field, what will be the effect on the coil?

What is the direction of induced current in a coil when the magnetic flux through it decreases?

Which of the following statements is TRUE about an electromagnet?

In a solenoid, how does the magnetic field inside change when the number of turns per unit length is increased?

A rectangular coil carrying current is placed in a magnetic field. Which of the following factors does NOT affect the torque experienced by the coil?