Home
Class 12
PHYSICS
When a metallic rod falls freely, keepin...

When a metallic rod falls freely, keeping its length horizontal and parallel to north-south direction, emf induced across it is ______

A

increases with time

B

decreases with time

C

zero

D

remains constant

Text Solution

Verified by Experts

The correct Answer is:
C
Because magnetic flux is not cut by the falling rod.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION

    KUMAR PRAKASHAN|Exercise Section D MCQs (MCQs asked in Competitive Exams )|38 Videos

  • ELECTROMAGNETIC INDUCTION

    KUMAR PRAKASHAN|Exercise Section C Ncert Exemplar Solution (Long Answer )|11 Videos

  • ELECTRIC CHARGES AND FIELDS

    KUMAR PRAKASHAN|Exercise SECTION D MCQS ASKED IN COMPETITIVE EXAMES (MCQS AKSED IN BOARD EXAM AND GUJCET)|14 Videos

  • ELECTROMAGNETIC WAVES

    KUMAR PRAKASHAN|Exercise BOARD.S QUESTION PAPER MARCH - 2020 (PART - B) SECTION - C|5 Videos

Similar Questions

Explore conceptually related problems

A conducting bar of 2m length is allowed to fall freely from a 50m high tower, keeping it aligned along the east-west direction. Find the emf induced in the rod when it is 20 m below the top of the tower. g = 10 "ms"^(-2) . Horizontal component of earth's magnetic field is 0.7 xx 10^(-4) T and angle of dip = 60^@ .

A long straight wire in the horizontal plane carries a current of 50 A in north to south direction. Give the magnitude and direction of B at a point 2.5 m east of the wire

Knowledge Check

  • A conducting bar of 3m length is allowed to fall freely from 80m high tower, keeping it aligned along the East-West direction. Find the emf induced in the rod when it is 20m below the top of tower. g=10 ms^(-2) , B_h=0.7xx10^(-4) T and angle of deep = 60^@ .

    A
    2.5 mV
    B
    2.1 mV
    C
    2.7 mV
    D
    1.2 mV

  • When current passing through a coil increases, direction of induced emf is

    A
    in the direction of existing current.
    B
    in the opposite direction of existing current
    C
    perpendicular to the flow of current.
    D
    indefinite

  • A metallic rod of mass per unit length 0.5kgm^(-1) is lying horizontally on a smooth inclined plane which makes an angle of 30^(@) with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction 0.25 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is.

    A
    11.32 A
    B
    7.14 A
    C
    14.76 A
    D
    5.98 A

    • Similar Questions

    Explore conceptually related problems

    A long straight wire in the horizontal plane carries a current of 50 A in north to south direction. Give the magnitude and direction of B at a point 2.5 m east of the wire.

    A uniform rod of length (L) and mass (M) is pivoted at the centre. Its two ends are attached to two springs of equal spring constants (k). The springs are fixed to rigid supports as shown in the figure, and the rod is free to oscillate in the horizontal plane. The rod is free to oscillate in the horizontal plane. The rod is gently pushed through a small angle (theta) in one direction and released. The frequency of oscillation is. ? (##JMA_CHMO_C10_009_Q01##).

    An electron falls throgh a distance of 1.5 cm in a uniform electric field of magnitude 2.0 xx10^(4) N c^(-1) the direction of the field is reversed keeping its magnitude unchanged and a proton falls through the same distance compute the time of falls in each case contrast the situation with that of free fall under gravity

    The north pole of a magnet is falling on a metallic ring as shown in the figure the direction of induced current , if looked from upside in the ring will be

    The horizontal component of the earth's magnetic field at a certain place is 2.5xx10^(-5)T and the direction of the field is from the geographic south to the geographic north. A very long straight conductor is carrying a steady current of 0.5 A. What is the force per unit length on it when it is placed on a horizontal table and the direction of the current is (a) east to west, (b) south to north?

    Home
    Profile