Ohm's Law, Resistance and Resistivity

JEE Main Physics · Current Electricity · 11 questions, latest first

• To determine the resistance (R) of a wire, a circuit is designed below. The V-I characteristic curve for this circuit is plotted…20249 April, Shift 2 · Q60
• A wire of resistance R and radius r is stretched till its radius became r / 2. If new resistance of the stretched wire is x R,…20246 April, Shift 1 · Q58
• Two wires A and B are made up of the same material and have the same mass. Wire A has radius of 2.0 mm and wire B has radius of…20244 April, Shift 2 · Q55
• Wheatstone bridge principle is used to measure the specific resistance (S_1) of given wire, having length L, radius r. If X is…202427 January, Shift 2 · Q50
• A wire of resistance 160 Ω is melted and drawn in a wire of one-fourth of its length. The new resistance of the wire will be202312 April, Shift 1 · Q42
• A rectangular parallelopiped is measured as 1 cm × 1 cm × 100 cm. If its specific resistance is 3 × 10^-7 Ω m, then the…202310 April, Shift 2 · Q60
• The length of a metallic wire is increased by 20 % and its area of cross section is reduced by 4 %. The percentage change in…20236 April, Shift 1 · Q55
• The resistance of a wire is 5 Ω. It's new resistance in ohm if stretched to 5 times of it's original length will be:202325 January, Shift 2 · Q13
• A uniform metallic wire carries a current 2 A, when 3.4 V battery is connected across it. The mass of uniform metallic wire is…202325 January, Shift 1 · Q11
• If a copper wire is stretched to increase its length by 20\%. The percentage increase in resistance of the wire is ____ \%.202324 January, Shift 2 · Q26
• A hollow cylindrical conductor has length of 3.14 m, while its inner and outer diameters are 4 mm and 8 mm respectively. The…202324 January, Shift 1 · Q29