Physics-
General
Easy
Question
The A.C. circuit shown in figure. Find the frequency (
) of the AC voltage source so that current through the source will be in same phase as of voltage of source.
The correct answer is:
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?
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The diagram shows a solenoid carrying time varying current I = I0 t (I0 is constant) On the axis of this solenoid a conducting ring is being placed as shown in figure. The mutual inductance of the ring and the solenoid is M and self inductance of the ring is L. If the resistance of the ring is R then the maximum current which can flow through the ring is
The diagram shows a solenoid carrying time varying current I = I0 t (I0 is constant) On the axis of this solenoid a conducting ring is being placed as shown in figure. The mutual inductance of the ring and the solenoid is M and self inductance of the ring is L. If the resistance of the ring is R then the maximum current which can flow through the ring is
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The maximum compression in the spring
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A solenoid is oriented end-on so that its opening is perpendicular to the circuit containing the two light bulbs as drawn in figure C1. For figure C2 and C3, a shorting wire of negligible resistance is added as shown. Assume that the magnetic field from the solenoid, shown coming out of the plane of the page, decreases uniformly with time at the same rate for each circuit. Rank the circuits for the brightness of the bulb labeled R1 from brightest to dimmest.
A solenoid is oriented end-on so that its opening is perpendicular to the circuit containing the two light bulbs as drawn in figure C1. For figure C2 and C3, a shorting wire of negligible resistance is added as shown. Assume that the magnetic field from the solenoid, shown coming out of the plane of the page, decreases uniformly with time at the same rate for each circuit. Rank the circuits for the brightness of the bulb labeled R1 from brightest to dimmest.
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A wire frame as shown in figure is made to rotate about a vertical axis passing through O. There exists a uniform horizontal magnetic field of induction B = 1 Tesla if 
If the frame rotates (slowly) about 'O' with angular velocity directed along Z-axis having magnitude w = 4rad/s, the potential difference between O & B is
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In given figure, a wire loop has been bent so that it has three segments: segment ab (a quarter circle), bc (a square corner), and ca (straight). Here are three choices for a magnetic field through the loop:
Where 
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In given figure, a wire loop has been bent so that it has three segments: segment ab (a quarter circle), bc (a square corner), and ca (straight). Here are three choices for a magnetic field through the loop:
Where is in milliteslas and t is in seconds. If the induced current in the loop due to are respectively then
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Three wire loops and an observer are positioned as shown in the figure. From the observer's point of view, a current I flows counterclockwise in the middle loop, which is moving towards the observer with a velocity v. Loops A and B are stationary. This same observer would notice that
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At t = 0 a charge q is at the origin and moving in the y-direction with velocity 
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At t = 0 a charge q is at the origin and moving in the y-direction with velocity in a magnetic field that is for y > 0 out of page and given by into the page and given The charge's subsequent trajectory is shown in the sketch. From this information, we can deduce that
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A conducting bar rolls down a slope made of conducting rails. The bottom ends of the rails are connected by another conducting rail as shown in the figure. There is a uniform magnetic field B pointing upward. Due to the bar's motion, there is an induced current in the bar-rail circuit. What is the direction of the magnetic force on the bar?
A conducting bar rolls down a slope made of conducting rails. The bottom ends of the rails are connected by another conducting rail as shown in the figure. There is a uniform magnetic field B pointing upward. Due to the bar's motion, there is an induced current in the bar-rail circuit. What is the direction of the magnetic force on the bar?
physics-General
