Advertisements
Advertisements
प्रश्न
Observe the following diagram and choose the correct alternative:
पर्याय
The intensity of magnetic field in A is larger than in B.
The intensity of magnetic field in B is less than in A.
The intensity of magnetic field A and B is same.
The intensity of magnetic field in A is less than in B.
Advertisements
उत्तर
The intensity of magnetic field in A is less than in B.
Explanation:
Magnetic field produced due to closed loop
`vec"B" ⇒ vec"B" ∝ "I"`
In diagram (A), I = `5/("R"_1 + "R"_2)`
In diagram (B), I = `5/((("R"_1 "R"_2))/("R"_1 + "R"_2))`
IB > IA so `vec"B"_"B" > vec"B"_"A"`
∴ The intensity of magnetic field in A is less than in B.
APPEARS IN
संबंधित प्रश्न
Will the compass needle show deflection when the switch in the circuit shown by figure is closed?
An electric bell has an electromagnet.
Name the scientist who discovered the magnetic effect of current.
Fill in the following blank with suitable words:
If a coil is viewed from one end and the current flows in an anticlockwise direction, then this end is a ........... pole.
If the direction of electric current in a solenoid when viewed from a particular end is anticlockwise, then this end of solenoid will be:
(a) west pole
(b) south pole
(c) north pole
(d) east pole
The direction of current flowing in the coil of an electromagnet at its two ends X and Y are as shown below:
What is the polarity of end X?
What is the polarity of end Y?
Name and state the rule which you have used to determine the polarities.
Name one device which works on the magnetic effect of current.
If fuse of 250 mA, 500 mA, 1 A, 5 A and 10 A were available, which one would be the most suitable for protecting an amplifier rated at 240 V, 180 W?
Write the correct option by observing the figures.
In the Activity shown below, how do we think the displacement of rod AB will be affected if
- current in rod AB is increased
- a stronger horse-shoe magnet is used
- length of the rod AB is increased?
|
(b) State whether the following statements are true or false:
(i) Magnetic poles exist in pairs.
(ii) Global warming is a desirable aspect of the intensified greenhouse effect.
Answer the following question:
State the effect on the magnetic needle in Oersted’s experiment when:
(a) the current is passed through the wire.
(b) the current through the wire is increased
(c) the current through the wire is reversed.
Name any two appliances which works on the phenomenon of magnetic effect of electric current.
A soft iron bar is introduced inside the current-carrying solenoid. The magnetic field inside the solenoid ____________.
Magnetic effect of current was discovered by ______.
______ cells cannot be recharged after use.
Sailors use ______ to find direction in order to navigate on the sea.
A rectangular loop ABCD carrying a current I is situated near a straight conductor XY, such that the conductor is parallel to the side AB of the loop and is in the plane of the loop. If a steady current I is established in the conductor as shown, the conductor XY will ______.
Using an electromagnet, you can make a working model of a railway signal as shown in figure.
