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asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Which of the following diagram is correct for the direction of magnetic force on a charge moving in a uniform magnetic

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A proton beam passes without deviation through a region of space. This space has uniform transverse mutually perpendicular electric and magnetic fields with `E=220 kV'/'m and B = 50 mT`. The velocity of the beam

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Assertion: A beam of electron can pass undeflected through a region of E and B. Reason: Force on moving charged particle due to magnetic field may be zero in some

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Assertion: Upper wire shown in figure is fixed. At a certain distance `x`, lower wire can remain in equilibrium.Reason: The above equilibrium of lower wire is stable

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Assertion: The current sensitivity of a galvanometer is the deflection of current per unit current passing through the coil. Reason: The galvanometer can be used as a detector to check, if a current is flowing in the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Which of the following expression represents the relation between orbital magnetic moment and orbital angular momentum of an

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Which of the following statement(s) is/are correct

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Assertion: The true geographic north direction can be found by using a compass needle. Reason: The magnetic meridian of the earth is along the axis of rotation of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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According to Faraday’s law of electromagnetic induction, the magnitude of the induced emf in a circuit is equal to the time rate of change

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A square loop of wire, side length `10 cm` is placed at angle of 45° with a magnetic field that changes uniformly from 0.1 T to zero in `0.7s`. The induced current in the loop (its resistance is 111)

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The magnitude of the earth’s magnetic field at a place is `B_0` and the angle of dip is `delta`. A horizontal conductor of length `L` lying in magnetic North-South moves eastwards with a velocity `v`. The emf induced across the conductor

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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If emf induced in a coil is `2V` by changing the current in it from `8A` to `6A` in `2 xx 10^(-3) s`, then the coefficient of self-induction

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The ratio of secondary to the primary turns in a transformer is 3 : 2. If the power output be P, then the input power neglecting all losses must be equal

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Assertion: When the capacitor is connected to an AC source, it limits or regulates the current, but does not completely prevent the flow of charge. Reason: The capacitor is alternately charged and discharged as the current reverses each

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Suppose while sitting in a parked car, you notice a jogger approaching towards you in the side view mirror of R = 2 m. If the jogger is running at a speed of 5 m s–1, how fast the image of the jogger appear to move when the jogger is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 3m away by means of a large convex lens. What is the maximum possible focal length of the lens required for the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Does short-sightedness (myopia) or long-sightedness (hypermetropia) imply necessarily that the eye has partially lost its ability of accommodation? If not, what might cause these defects of

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Explain: The angle subtended at the eye by an object is equal to the angle subtended at the eye by the virtual image produced by a magnifying glass. In what sense then does a magnifying glass provide angular

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For the same value of angle of y incidence, the angles of refraction in three media A, B and C are 15°, 25° and 35° respectively. In which medium, would the velocity of light be

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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