EASY
10th CBSE
IMPORTANT
Earn 100

A copper wire is connected to the terminals of a charged battery. The wire is now kept between the poles of a strong horseshoe magnet in such a way that the force experienced by the wire is maximum.

On the basis of the above information, answer the following:

If the connections to the positive and negative terminals are interchanged and the polarity of the horseshoe magnet is also reversed, how will the direction of the force exerted change?

50% studentsanswered this correctly

Important Questions on Magnetic Effects of Electric Current

EASY
10th CBSE
IMPORTANT

In the following table, Column I give the unknown and Column II gives the rules to find the unknown. Match the items in Column I to those in Column II.

Column I Column II
(a) Direction of magnetic field at a point due to a current-carrying conductor.

(p) Fleming's left-hand rule

(b) Direction of force experienced by a current-carrying conductor placed in a magnetic field (q) Clock-face rule
(c) Polarity of a current-carrying solenoid (r) Fleming's right-hand rule
  (s) Maxwell's right-hand thumb rule
HARD
10th CBSE
IMPORTANT
We know that when electric current passes through a wire, a magnetic field is produced. Why doesn't the wire of your study lamp attract pieces of iron when the lamp is switched on?
EASY
10th CBSE
IMPORTANT

A student performs an experiment to study the magnetic effect of current around a current-carrying straight conductor. He reports that

(i) the direction of deflection of the North Pole of a compass needle kept at a given point near the conductor remains unaffected even when the terminals of the battery sending current in the wire are interchanged.

(ii) For a given battery, the degree of deflection of the North Pole of the compass decreases when it is kept at a point farther away from the conductor.

Which of the two observations is correct and why?

EASY
10th CBSE
IMPORTANT

A current-carrying conductor is placed perpendicular to the magnetic field of a horseshoe magnet. The conductor is displaced upwards. State what will happen to the displacement of the conductor when

(a) the current in the conductor is increased.

EASY
10th CBSE
IMPORTANT

A current-carrying conductor is placed perpendicular to the magnetic field of a horseshoe magnet. The conductor is displaced upwards. State what will happen to the displacement of the conductor when

(b) The horseshoe magnet is replaced by a stronger magnet.

MEDIUM
10th CBSE
IMPORTANT

A current-carrying conductor is placed perpendicular to the magnetic field of a horseshoe magnet. The conductor is displaced upwards. State what will happen to the displacement of the conductor when the length of the conductor is increased.

EASY
10th CBSE
IMPORTANT
An alternating current has a frequency of 50 Hz. How many times does it change its direction in one second?
EASY
10th CBSE
IMPORTANT
Define electromagnetic induction.